Preeyanuch Saengjessada และ Supanee Jivasak-Apimas. (2009) Knowledge level and attitudes about HPV vaccines as related to cervical cancer amongst female undergraduate students in two universities in Bangkok. Thammasat University:ม.ป.ท.Preeyanuch Saengjessada และ Supanee Jivasak-Apimas. 2009. Knowledge level and attitudes about HPV vaccines as related to cervical cancer amongst female undergraduate students in two universities in Bangkok. ม.ป.ท.:Thammasat University;Preeyanuch Saengjessada และ Supanee Jivasak-Apimas. Knowledge level and attitudes about HPV vaccines as related to cervical cancer amongst female undergraduate students in two universities in Bangkok. ม.ป.ท.:Thammasat University, 2009. Print.