Gaya APA

al., E., Rogerson, H, D. (1988). Words for students of english : A vocabulary series for esl Vol. 2 . Pittsburg: The University of Pittsburgh.

Gaya MLA

al., Et., Rogerson, Holly, Deemer. "Words for students of english : A vocabulary series for esl Vol. 2". Pittsburg: The University of Pittsburgh, 1988. Text.