DAVIDSON, G. (2003). VERBS AND TENSES ( A COMPREHENSIVE GUIDE TO MASTERING THE USE OF ENGLISH VERBS AND TENSES) (1st.). LEARNERS PUBLISHING.
Lua i Stíl Chicago (17ú heag.)DAVIDSON, GEORGE. VERBS AND TENSES ( A COMPREHENSIVE GUIDE TO MASTERING THE USE OF ENGLISH VERBS AND TENSES). 1st. SINGAPORE: LEARNERS PUBLISHING, 2003.
Lua MLA (9ú heag.)DAVIDSON, GEORGE. VERBS AND TENSES ( A COMPREHENSIVE GUIDE TO MASTERING THE USE OF ENGLISH VERBS AND TENSES). 1st. LEARNERS PUBLISHING, 2003.
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