Παραπομπή σε μορφή APA (7η εκδ.)
Rybold, G., & Harvey-Smith, N. (2013). Speaking, listening and understanding: English language debate for non-native speakers (Revised edition.). International Debate Education Association.
Παραπομπή σε μορφή Chicago (17η εκδ.)
Rybold, Gary, και Neill Harvey-Smith. Speaking, Listening and Understanding: English Language Debate for Non-native Speakers. Revised edition. New York: International Debate Education Association, 2013.
Παραπομπή σε μορφή MLA (9th εκδ.)
Rybold, Gary, και 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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