Cita APA (7th ed.)

Mitchner, E. A., & Tuffs, R. J. (1989). One world. Reidmore Books.

Cita Chicago (17th ed.)

Mitchner, E. Alyn, i R. Joanne Tuffs. One World. Edmonton: Reidmore Books, 1989.

Cita MLA (9th ed.)

Mitchner, E. Alyn, i R. Joanne Tuffs. One World. Reidmore Books, 1989.