Cita APA

Robinson, B. (1989). Focus: An ESL grammar. New York: St. Martin's Press.

Chicago Style Citation

Robinson, Barbara. Focus: An ESL Grammar. New York: St. Martin's Press, 1989.

Cita MLA

Robinson, Barbara. Focus: An ESL Grammar. New York: St. Martin's Press, 1989.

Atenció: Aquestes cites poden no estar 100% correctes.