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Opoku-Amankwa, Kwasi, Aba Brew-Hammond, and Francis Elsbend Kofigah. 2011. ‘What Is in a Textbook? Investigating the Language and Literacy Learning Principles of the “Gateway to English” Textbook Series’. Pedagogy, Culture & Society 19 (2): 291–310. https://doi.org/10.1080/14681366.2011.582264.
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Tomlinson, Brian. 2012. ‘Materials Development for Language Learning and Teaching’. Language Teaching 45 (02): 143–79. https://doi.org/10.1017/S0261444811000528.
Tomlinson, Brian and ebrary, Inc. 2013. Applied Linguistics and Materials Development. Bloomsbury Academic. Electronic resource. http://site.ebrary.com/lib/unmc/Doc?id=10632601.
