Dhungana และ Keshab Raj. (1993) A hospital-based case-control study of oral contraceptive use as a risk factor for breast cancer. Mahidol University,:ม.ป.ท.Dhungana และ Keshab Raj. 1993. A hospital-based case-control study of oral contraceptive use as a risk factor for breast cancer. ม.ป.ท.:Mahidol University,;Dhungana และ Keshab Raj. A hospital-based case-control study of oral contraceptive use as a risk factor for breast cancer. ม.ป.ท.:Mahidol University, 1993. Print.