Rossi Yanne และ Pramote Prasartkul. (2012) Willingness to use contraceptive methods among unmarried youth in Indonesia. Mahidol University:ม.ป.ท.Rossi Yanne และ Pramote Prasartkul. 2012. Willingness to use contraceptive methods among unmarried youth in Indonesia. ม.ป.ท.:Mahidol University;Rossi Yanne และ Pramote Prasartkul. Willingness to use contraceptive methods among unmarried youth in Indonesia. ม.ป.ท.:Mahidol University, 2012. Print.