Bedi, Y. (2013). Unreadable readings. The Book of Mah Keliat: Information, Communication and Epistemology, 4, 33-37.
Carrell, P.L. (1987). Readability in ESL. Reading in a Foreign Language, 4(1), 21– 40. Retrieved from
http://nflrc.hawaii.edu/rfl/PastIssues/rfl41carrell.pdf
Charzynska, E. Debowski, L. (2015). Empirical verification of the polish formu of Text Difficalty. Cognitive Studies, 15, 125-132.
Chen. J. (2012). A Survey of New Readibility Formulas. US-China Foreign Language, 10(12), 1779-1783.
DuBay, W. H. (2004). The Principles of Readability. Retrieved from http://www.impact-information.com/ impactinfo/readability02.pdf
Dahlgren, P. (2006). "Television and the general scope of civil society and mass media",, translated by Mehdi Shafghati, second edition, Tehran: Soroush.
Dashti, R. & Zangi, E. & Soroush, T. (2014). Evaluating and measuring the readability of the books of Heaven's Gifts in the sixth grade based on the formula of Fleshoff Fry and Ganin. Third National Conference on Sustainable Development in Educational Sciences and Psychology, Social and Cultural Studies, Tehran: Soroush Mortazavi Islamic Research, Center for Sustainable Development. _ http://www.civilica.com/ paper- EPSCONF03. 205 Html
Dayani, M. H. (2000). Measuring the readability of Persian writings; Reading and writing for children, newly literate and teenagers. Mashhad: Computer Library.
Diyani, M. H. (2002). Readability of Persian writings, Mashhad: Computer Library Publications
Graesser, A.C., McNamara, D.S., Cai, Z., Conley, M., Li, H., & Pennebaker, J. (2014). Coh-Metrix measures text characteristics at multiple levels of language and discourse. The Elementary School Journal, 15(2), 210-229
Humphreys, A. H. & Humphreys, J. T. (2013). Reading difficulty levels of selected articles in the Journal of Research in Music Education and Journal of Historical Research in Music Education. Music Education Research International, 6, 15-25
Klare, G. R. (1963). The Measurement of Readability. Ames, Iowa: Iowa State University Press.
Marnell, G. (2008). Measuring Readibility: Part 1: The Spirit is willing but the Flesch is Weak. Southern Communicator, 14, 12-18
Mohammadi Ethreghele, M. Ismaili, M. Rahimi, M A. & Mohammadi, M. (2015). Content analysis of the reading level of Persian books
Mafotun, P. Accurate, M. (2001). Criterion for determining the readability of Persian translations of English texts, Research Journal of Humanities, Spring 2019, Number 29
Piraish, S. (2013). Analysis of the text content of the books to read and write in the fourth grade of elementary school in 1992-1993. Based on Gunning and Fry's readability formula (Master's thesis). Islamic Azad University Marodasht branch. Faculty of Education and Psychology.
University of Missouri website. "Principles of easy reading and easy writing":
http://extension.missouri.edu/publications/DisplayPub.aspx?P=CM201
Wasko, J. (2005). ©by Blackwell Publishing Ltd: A Companion to Television
Zandieh, M. Amini G, soul of... Fazl E, Heydari, F (2014). Evaluating and measuring the readability of the social science book of the sixth grade based on Flash and Laughlin formulas. Annual conference of new research approaches in human sciences. Tehran: Ide Pardaz Institute of Capital Vira.