高洁. (2008). 雅思口语五步制胜: Ten-day step-by-step guide to the IELTS speaking test. 世界知识出版社.
Chicago (17e ed.) Bronvermelding高洁. 雅思口语五步制胜: Ten-day Step-by-step Guide to the IELTS Speaking Test. 世界知识出版社, 2008.
MLA (8e ed.) Bronvermelding高洁. 雅思口语五步制胜: Ten-day Step-by-step Guide to the IELTS Speaking Test. 世界知识出版社, 2008.
Let op: Deze citaties zijn niet altijd 100% accuraat.