Gaya APA

DUFFY, C, B., MAHNKE, M, K. (1996). THE HEINEMANN ELT TOEFL PRATICE TESTS (NEW EDITION). New Jersey: MACMILLAN PUBLISHING COMPANY.

Gaya MLA

DUFFY, Carolyn, B., MAHNKE, M, Kathkeen. "THE HEINEMANN ELT TOEFL PRATICE TESTS". NEW EDITION New Jersey: MACMILLAN PUBLISHING COMPANY, 1996. Text.