Cita APA (7a ed.)

Alexander, L. G., & Kingsbury, R. V. (1975). Mainline: Skills A : students' book (New. imp.). Longman.

Cita Chicago Style (17a ed.)

Alexander, L. G., y Roy,. Vincent Kingsbury. Mainline: Skills A : Students' Book. New. imp. London: Longman, 1975.

Cita MLA (9a ed.)

Alexander, L. G., y Roy,. Vincent Kingsbury. Mainline: Skills A : Students' Book. New. imp. Longman, 1975.