APA-referens (7:e uppl.)

Gupta, V. (2009). Vocabulary and Comprehension Skills. Penguin Books.

Chicago-referens (17:e uppl.)

Gupta, Vaishali. Vocabulary and Comprehension Skills. USA: Penguin Books, 2009.

MLA-referens (9:e uppl.)

Gupta, Vaishali. Vocabulary and Comprehension Skills. Penguin Books, 2009.