ENGLISH & LEN, E. [. (1993). English enrichment exercises: Primary 4. Binarupa Aksara.
芝加哥风格引文ENGLISH 与 Evelyn [ed] LEN. English Enrichment Exercises: Primary 4. Jakarta: Binarupa Aksara, 1993.
MLA引文ENGLISH 与 Evelyn [ed] LEN. English Enrichment Exercises: Primary 4. Binarupa Aksara, 1993.
警告：这些引文格式不一定是100％准确.