Chang และ Chun. (1999) HIV/AIDS preventive behavior (condom use) and its determinants among female commercial sex workers in Beijing, China /. Mahidol University,:ม.ป.ท.Chang และ Chun. 1999. HIV/AIDS preventive behavior (condom use) and its determinants among female commercial sex workers in Beijing, China /. ม.ป.ท.:Mahidol University,;Chang และ Chun. HIV/AIDS preventive behavior (condom use) and its determinants among female commercial sex workers in Beijing, China /. ม.ป.ท.:Mahidol University, 1999. Print.