Cita APA

Costinett, S., & Roos, G. (1973). American English for international businessmen. Silver Spring, Md.: Institute of Modern Lenguajes.

Citación estilo Chicago

Costinett, Sandra, y Gordon Roos. American English for International Businessmen. Silver Spring, Md.: Institute of Modern Lenguajes, 1973.

Cita MLA

Costinett, Sandra, y Gordon Roos. American English for International Businessmen. Silver Spring, Md.: Institute of Modern Lenguajes, 1973.