Cita APA (7a ed.)

Grellet, F., Maley, A., Welsing, W., Coe, N., & Green, P. (1982). Quartet: Teacher's Book 1. Oxford University Press.

Cita Chicago Style (17a ed.)

Grellet, Françoise, Alan Maley, Wim Welsing, Norman Coe, y Phil Green. Quartet: Teacher's Book 1. Oxford: Oxford University Press, 1982.

Cita MLA (9a ed.)

Grellet, Françoise, et al. Quartet: Teacher's Book 1. Oxford University Press, 1982.