Casslén, B. (1981). Proteinases and proteinase inhibitors in uterine fluid: With special reference to IUD-users. Scandinavian Association of Obstetricians and Gynecologists.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Casslén, Bertil. Proteinases and Proteinase Inhibitors in Uterine Fluid: With Special Reference to IUD-users. Lund: Scandinavian Association of Obstetricians and Gynecologists, 1981.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Casslén, Bertil. Proteinases and Proteinase Inhibitors in Uterine Fluid: With Special Reference to IUD-users. Scandinavian Association of Obstetricians and Gynecologists, 1981.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.