Citazione Stile APA (7a Edizione)

Keller, D. P., & Thrush, E. A. (1987). Interactions I. A speaking activities book (1a. ed.). Random House.

Citazione stile Chigago Style (17a edizione)

Keller, Deborah Poole, e Emity Austin Thrush. Interactions I. A Speaking Activities Book. 1a. ed. Nueva York: Random House, 1987.

Citatione MLA (9a ed.)

Keller, Deborah Poole, e Emity Austin Thrush. Interactions I. A Speaking Activities Book. 1a. ed. Random House, 1987.