Rybold, G., & Harvey-Smith, N. (2013). Speaking, listening and understanding: English language debate for non-native speakers (Revised edition.). International Debate Education Association.
Citace podle Chicago (17th ed.)Rybold, Gary, a Neill Harvey-Smith. Speaking, Listening and Understanding: English Language Debate for Non-native Speakers. Revised edition. New York: International Debate Education Association, 2013.
Citace podle MLA (9th ed.)Rybold, Gary, a Neill Harvey-Smith. Speaking, Listening and Understanding: English Language Debate for Non-native Speakers. Revised edition. International Debate Education Association, 2013.
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