Johnson, Mark D., Anthony Acevedo, and Leonardo Mercado. “What Vocabulary Should We Teach? Lexical Frequency Profiles and Lexical Diversity in Second Language Writing”. Writing and Pedagogy 5, no. 1 (May 30, 2013): 83-103. Accessed September 18, 2020. https://journal.equinoxpub.com/WAP/article/view/7447.