Richards, J. C., Bycina, D., Wisniewska, I., & London, A. (2006). Person to person communicative speaking and listening skills. Test booklet 1 (3a. ed.). Oxford University Press.
Chicago-čujuhus (17. p.)Richards, Jack C., David Bycina, Ingrid Wisniewska, juo Andy London. Person to Person Communicative Speaking and Listening Skills. Test Booklet 1. 3a. ed. Nueva York: Oxford University Press, 2006.
MLA-čujuhus (9. p.)Richards, Jack C., et al. Person to Person Communicative Speaking and Listening Skills. Test Booklet 1. 3a. ed. Oxford University Press, 2006.
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