Betty Schrampfer Azar. (2000). Understanding and using English grammar: Workbook Volume A. Hà Nội: Thanh Niên.
शिकागो स्टाइल उद्धरणBetty Schrampfer Azar. Understanding and Using English Grammar: Workbook Volume A. Hà Nội: Thanh Niên, 2000.
एमएलए उद्धरणBetty Schrampfer Azar. Understanding and Using English Grammar: Workbook Volume A. Hà Nội: Thanh Niên, 2000.
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