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 Style (17th ed.) Citation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 citiranje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.
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