Cita APA

Fries, C. C. n. 1., & Rojas, P. M. (1952). American English series: For the study of English as a second language. Boston: Heath.

Citación estilo Chicago

Fries, Charles Carpenter n. 1887, y Pauline M. Rojas. American English Series: For the Study of English As a Second Language. Boston: Heath, 1952.

Cita MLA

Fries, Charles Carpenter n. 1887, y Pauline M. Rojas. American English Series: For the Study of English As a Second Language. Boston: Heath, 1952.