Oï Dell, F., & Black, M. (2015). Advanced trainer: Six practice tests with answers (2a. ed.). Cambridge University Press.
Citace podle Chicago (17th ed.)Oï Dell, Felicity, a Michael Black. Advanced Trainer: Six Practice Tests with Answers. 2a. ed. Cambridge: Cambridge University Press, 2015.
Citace podle MLA (9th ed.)Oï Dell, Felicity, a Michael Black. Advanced Trainer: Six Practice Tests with Answers. 2a. ed. Cambridge University Press, 2015.
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