Gaya APA

al., E. et al (1976,1980). Vocabulary In Context: An Intensive Course In English-english Language Institute (-). Ann Arbor: The University of Michigan Press.

Gaya MLA

al., Et. et al. "Vocabulary In Context: An Intensive Course In English-english Language Institute". - Ann Arbor: The University of Michigan Press, 1976,1980. Text.