Citazione Stile APA (7a Edizione)

Alen, J., & MacLeod, A. (1983). Snap: Activity book: an English course for younger learners: stage 1 (1.ed.). Heinemann International.

Citazione stile Chigago Style (17a edizione)

Alen, Jon, e Ainslie MacLeod. Snap: Activity Book: An English Course for Younger Learners: Stage 1. 1.ed. Oxford, Inglaterra: Heinemann International, 1983.

Citatione MLA (9a ed.)

Alen, Jon, e Ainslie MacLeod. Snap: Activity Book: An English Course for Younger Learners: Stage 1. 1.ed. Heinemann International, 1983.