Gaya APA

Porter, P, A., Grant, M. (1992). Communicating Effectively in English : Oral Communication for Non-Native Speakers (II). California: Wadsworth Publishing Comp..

Gaya MLA

Porter, Patricia, A.., Grant, Margaret. "Communicating Effectively in English : Oral Communication for Non-Native Speakers". II California: Wadsworth Publishing Comp., 1992. Text.