Barbisan, C., Concari, L., Rodríguez, M., & Urrestarazu, J. (1985). Snap!: Activity Book 3. An English Course for Younger Learners (1a. ed.). Heinemann Educational Books.
Chicago-viite (17. p.)Barbisan, C., L. Concari, M. Rodríguez, ja J. Urrestarazu. Snap!: Activity Book 3. An English Course for Younger Learners. 1a. ed. London: Heinemann Educational Books, 1985.
MLA-viite (9. p.)Barbisan, C., et al. Snap!: Activity Book 3. An English Course for Younger Learners. 1a. ed. Heinemann Educational Books, 1985.
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