Gaya APA

Porter, P, A., Grant, M. (1992). Communicating effectively in english : oral communication for non-native speakers (2nd ed.). California: Wadsworth Publishing Co..

Gaya MLA

Porter, Patricia, A.., Grant, Margaret. "Communicating effectively in english : oral communication for non-native speakers". 2nd ed. California: Wadsworth Publishing Co., 1992. BUKU.