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.
Dyfyniad Arddull Chicago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.
Dyfyniad MLA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.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.