Cita APA

Sullivan, P. N., & Zhong, G. Y. Q. (1989). TOEFL skills for top scores. New York: Arco.

Citación estilo Chicago

Sullivan, Patricia N., and Grace Yi Qiu Zhong. TOEFL Skills for Top Scores. New York: Arco, 1989.

Cita MLA

Sullivan, Patricia N., and Grace Yi Qiu Zhong. TOEFL Skills for Top Scores. New York: Arco, 1989.