Ahmad, M. (2002). Dastan yek shar. Tehran: Moein
Aryanpour, A. ( 2001). Poshte divarhay boland. Tehran: Markaz.
Akhlaghi, F. (1995). The Semantic and Syntactic Study of Modal verbs in Modern Persian Language. Doctoral dissertation, Humanity Science Research and Cultural Study Center, Tehran, Iran.
Aghagolzadeh, F. & Abasi, z. (2012). Teaching Persian Subjunctive Mood and Tense to NonPersian Students Based on Cognitive Linguistics (Mental Spaces Theory). Doctoral dissertation, Tarbiyat Modars university, , Tehran, Iran.
Bateni, M. (1975). Persian Language Grammar, Tehran: Amirkabir..
Boyer, J. (1987). Language Contact conflict, Montreal University Press.
Bybee, J., Perkins., R., &Pagliuca , W. ( 1994). The Evolution of Grammar: Tense, Aspect and Modality in the Languages of the World. Chicago: The University of Chicago Press.
Croft,W., & Cruse,D. A. (2004). Cognitive Linguistics. Cambridge: Cambridge University Press.
Dabirseyaghi, M. (1956). Persian Language Grammar, Tehran: Amirkabir.
Daei javad, R. (1961). Persian Language Grammar, M. A. thesis, Tehran University, Tehran, Iran.
Evans, V., & Green, M. (2006) A Glossary of Cognitive Linguistics. Edinburg: Edinburg University Press Ltd.
Farukhpaei, M. (1979). language and linguistics. Tehran: Samt..
Farshidvard, Kh. (2005). Modern comprehensive Grammar, Tehran: Sokhan.
Garib, A., Bahar, M. T., Homaei, j., Fooruzanfar, B., & Yasemi, R. (1921). Persian Language Grammar, Tehran: Amirkabir.
Gholamalizade, Kh. (2005). Persian Language Structure, Tehran: Ehyaketab.Houshang, G. (2000). Jobeh khane. Tehran: Nilooufar.
Hopper, P. J. & Traugott, Elizabeth, C. (1993). Grammaticalization. Cambridge: Cambridge University Press (Cambridge Textbooks in Linguistics) (2nd ed. 2003).
Kratzer,A. (1977). What 'must' and 'can ' mean. Linguistics and Philosophy 1:337-355.
Ilkhanipour, N. (2015). Modal Adjectives in Persian . Tehran: Nashr-e Markaz.
Lakoff, G. (1990). The Invariance Hypothesis: is abstract reason based on image schemas?, Cognitive linguistics, 1,1,39-74.
Langacker, R. (1987). Foundations of Cognitive Grammar, Vol.1.Stanford: Stanford University Press.
_________. (2005).Cognitive Grammar: A Basic Introduction. Oxford: Oxford University Press.
_________. (2008) Cognitive Grammar: A Basic Introduction. Oxford: Oxford University Press.
Lyons, J. (1977). Semantics, Vol. 2.Cambridge: Cambridge University Press.
Maroofi, M. (2004). Samfouni mordegan. Tehran: Ghoghnous.
Miller, J. (Eds.). Concise Encyclopedia of Grammatical Categories,Oxford: Elsevier, 229-235.
Moradi Kermani, H. ( 2000). Shoma ke gharibe nistid. Tehran: Moein.
Naghzgoyikohan, M. (2011).The Comparison between Grammaticalization and Degrammaticalization in Modern Persian( Case Study: The Conversion of some Inflectional affixes to Derivational ones), Journal of Linguistics and Khorsan Dialects.
Natelkhanlari, P. (1987). The history of Persian Language, Vol.2, Tehran: Nei Publication.
Palmer, F. R. (1986). Mood and modality. Cambridge: Cambridge University Press.
Palmer, F. R. (1990). Modality and the English Modals, second ed. London: Longman.
Palmer, F. R. (1998). Mood and Modality: basic principles. In: Brown, K. and J.
Pirzad, Z. ( 2004). Adat mikonim. Tehran: Markaz.
Portner, P. (2005). Imperative and Modals in Natural Language Semantics . Oxford University Press.
Portner, P. (2009).Mood & Modality . Oxford University Press.
Rosch, E. (1975).Cognitive representations of semantic categories. Journal of Experimental psychology: General, 104(3), 665-233.
Rasekhmahand, M. (2010). Introduction on Theories and Concepts, Tehran: Samt
Rahimiyan, J. (1999). Verb Mood in Modern Persian Language, Humanity and Social Science Journal, 14(2), 41-52.
Safavi, K. (2001). Introduction on Semantics, Tehran: Research and Islamic Art.
Samare, Y. (1993). Teaching Persian Language, Book 1, Introductory Level, Tehran: International Almahdi.
Sanei, P. (2004). Pedar an digari. Tehran: Ruzbahan.
Shafaei, A. (1984). The Scientific Principals of Modern Persian Grammar, Tehran: Novin.
Shariyat, M. J. (2005). Persian Language Grammar, Tehran: Asatir.
Saeed. J. R. (1997). Semantics, Oxford: Blackwell.
__________. (1990).Semantics, London: Wiley-Blackwell.
Taleghani, H. A. (2008). Modality, aspects and negation in Persian, Toronto University Press.
Vafi, F. ( 2004). Roya tabat.Tehran: Markaz.
Vahidiyankamkar, T.(1994). Subjunctive Mood and Verb Tenses, Linguistic Journal, 11(2), 95-108.