Or Vathanak. (1999) Unsafe sex practices and its correlates among commercial sex worker in Phnom Penh, Cambodia. Mahidol University,:ม.ป.ท.Or Vathanak. 1999. Unsafe sex practices and its correlates among commercial sex worker in Phnom Penh, Cambodia. ม.ป.ท.:Mahidol University,;Or Vathanak. Unsafe sex practices and its correlates among commercial sex worker in Phnom Penh, Cambodia. ม.ป.ท.:Mahidol University, 1999. Print.