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Opoku-Amankwa K, Brew-Hammond A, Kofigah FE. What is in a textbook? Investigating the language and literacy learning principles of the ‘Gateway to English’ textbook series. Pedagogy, Culture & Society. 2011;19(2):291-310. doi:10.1080/14681366.2011.582264
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Carol Ann Tomlinson. How to Differentiate Instruction in Mixed-Ability Classrooms. Association for Supervision & Curriculum Development; 2001. https://ebookcentral.proquest.com/lib/unmc-ebooks/reader.action?docID=3002067&ppg=10
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Mishan F, Timmis I. Materials Development for TESOL. Edinburgh University Press; 2015. https://ebookcentral.proquest.com/lib/nottingham/detail.action?docID=4306117
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Tomlinson B, ebrary, Inc. Applied Linguistics and Materials Development. Bloomsbury Academic; 2013. http://site.ebrary.com/lib/unmc/Doc?id=10632601
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