توثيق جمعية علم النفس الأمريكية APA (الطبعة السابعة)

Cheang, A. W. H. (1988). The application of the anti progestin RU486 (mifepristone) as an abortifacient and in preoperative cervical dilatation. Dept. of Obstetrics & Gynaecology, National University of Singapore.

توثيق أسلوب شيكاغو (الطبعة السابعة عشر)

Cheang, Amy Won Heng. The Application of the Anti Progestin RU486 (mifepristone) as an Abortifacient and in Preoperative Cervical Dilatation. Singapore: Dept. of Obstetrics & Gynaecology, National University of Singapore, 1988.

توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)

Cheang, Amy Won Heng. The Application of the Anti Progestin RU486 (mifepristone) as an Abortifacient and in Preoperative Cervical Dilatation. Dept. of Obstetrics & Gynaecology, National University of Singapore, 1988.