Jupp, T. C., Prowse, P., Garton-Sprenger, J., & Milne, J. (1979). Encounters: Students' book, part A, main course english (1a. ed.). Heinemann Educational Books.
Citazione stile Chigago Style (17a edizione)Jupp, T. C., Philip Prowse, Judy Garton-Sprenger, e John Milne. Encounters: Students' Book, Part A, Main Course English. 1a. ed. Londres: Heinemann Educational Books, 1979.
Citatione MLA (9a ed.)Jupp, T. C., et al. Encounters: Students' Book, Part A, Main Course English. 1a. ed. Heinemann Educational Books, 1979.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.