Tay, B. (2007). Biology InsightsO Level Theory Workbook [teachers edition]Beverly Tay. Pearson Longman.
Chicago-referens (17:e uppl.)Tay, Beverly. Biology InsightsO Level Theory Workbook [teachers Edition]Beverly Tay. Pearson Longman, 2007.
MLA-referens (8:e uppl.)Tay, Beverly. Biology InsightsO Level Theory Workbook [teachers Edition]Beverly Tay. Pearson Longman, 2007.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.