| 1 |
Impact listening / Jill Robbins, Andrew MacNeill
2 : Student Book,2 : Teacher's Manual,2 : Audio Cassettes. - Hong Kong : Pearson Education , 2001
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| 2 |
Impact grammar : grammar through listening / Rod Ellis, Stephen Gaies
[Text],CD. - Hong Kong : Longman , 1999
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| 3 |
Impact topics : 30 exciting topics to talk about in English / Richard R. Day, Junko Yamanaka
Hong Kong : Longman , 1999
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| 4 |
Impact issues / Richard R. Day, Joseph Shaules, Junko Yamanaka
1,2,3. - New ed. - Hong Kong : Pearson Longman Asia ELT , 2009
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| 5 |
Impact issues / Richard R. Day, Joseph Shaules, Junko Yamanaka
1 student book,2 student book,3 student book. - 3rd ed. - Singapore : Pearson Education South Asia , 2019
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