Gaya APA

Matthiesen, S, J. (2017). Essential Words for the TOEFL 7th Edition (7th Edition). New York: Barron’s Educational Series.

Gaya MLA

Matthiesen, Steven, J.. "Essential Words for the TOEFL 7th Edition". 7th Edition New York: Barron’s Educational Series, 2017. Koleksi Elektronik.