Pora, y. (2003). Develop your vocabulary grammar and idiom. Pustaka Pelajar.
芝加哥风格引文Pora, yusran. Develop Your Vocabulary Grammar and Idiom. Pustaka Pelajar, 2003.
MLA引文Pora, yusran. Develop Your Vocabulary Grammar and Idiom. Pustaka Pelajar, 2003.
警告：这些引文格式不一定是100％准确.