Kulier, R., Helmerhorst, F. M., Maitra, N., & Gülmezoglu, A. M. (2004). Effectiveness and acceptability of progestogens in combined oral contraceptives – a systematic review. BioMed Central.
استشهاد بنمط شيكاغوKulier, Regina, Frans M. Helmerhorst, Nandita Maitra, و A Metin Gülmezoglu. Effectiveness and Acceptability of Progestogens in Combined Oral Contraceptives – a Systematic Review. BioMed Central, 2004.
MLA استشهادKulier, Regina, Frans M. Helmerhorst, Nandita Maitra, و A Metin Gülmezoglu. Effectiveness and Acceptability of Progestogens in Combined Oral Contraceptives – a Systematic Review. BioMed Central, 2004.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.