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| 2 | • Barraja-Rohan, A. M. & Ruth Pritchard, A. M. (1997). Beyond Talk. TAFE Publishing. |
| 3 | • BBC (2003). Better speaking: A guide to improving your spoken English. British Broadcasting Cooperation. |
| 4 | • Biber, D., Conrad, S., & Leech, G. (2002). Longman student grammar of spoken and written English. Harlow: Longman. |
| 5 | • Rooks, G. (1988). The non-stop discussion workbook. Boston: Heinle & Heinle Publishers. |