Gaya APA

Mahnke, M, K., Duffy, C, B. (1996). TOEFL PREPARATION COURSE "The most complete TOEFL book on the market" . United Kingdom: Macmillan Heinemann.

Gaya MLA

Mahnke, M., Kathleen., Duffy, Carolyn, B.. "TOEFL PREPARATION COURSE "The most complete TOEFL book on the market"". United Kingdom: Macmillan Heinemann, 1996. Text.