Ubolwan Promwong. 2009. Factors associated with pregnancy among primigravida adolescents at King Chulalongkorn Memorial Hospital. Faculty of Medicine Ramathibodi Hospital, Mahidol University;
Ubolwan Promwong. (2009) Factors associated with pregnancy among primigravida adolescents at King Chulalongkorn Memorial Hospital . Mahidol University/Bangkok.
Ubolwan Promwong. Factors associated with pregnancy among primigravida adolescents at King Chulalongkorn Memorial Hospital. . Bangkok:Mahidol University, 2009.
Ubolwan Promwong. (2009) Factors associated with pregnancy among primigravida adolescents at King Chulalongkorn Memorial Hospital . Mahidol University/Bangkok.