Citazione Stile APA (7a Edizione)
Porter, P. A., & Grant, M. (1992). Communicating effectively in english: Oral communication for non-native speakers (2a ed.). Heinle Cengage learing.
Citazione stile Chigago Style (17a edizione)
Porter, Patricia A., e Margaret Grant. Communicating Effectively in English: Oral Communication for Non-native Speakers. 2a ed. Boston: Heinle Cengage learing, 1992.
Citatione MLA (9a ed.)
Porter, Patricia A., e Margaret Grant. Communicating Effectively in English: Oral Communication for Non-native Speakers. 2a ed. Heinle Cengage learing, 1992.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.