Baker, L., Gershon, S., & Zemach, D. E. [. c. (2012). Skillful listening & speaking: Student's book 1. Macmillan education.

Baker, Lida, Steven Gershon, and Dorothy E. [series consultant] Zemach. Skillful Listening & Speaking: Student's Book 1. London: Macmillan education, 2012.

Baker, Lida, et al. Skillful Listening & Speaking: Student's Book 1. Macmillan education, 2012.