Yinyon Seniwong Na Ayudhya และผู้แต่งคนอื่นๆ. (2001) Major factors influencing the healthy city policy implementation in Bangkok Metropolis : a study on the vended food sanitation improvement policy. National Institute of Development Administration:ม.ป.ท.Yinyon Seniwong Na Ayudhya และผู้แต่งคนอื่นๆ. 2001. Major factors influencing the healthy city policy implementation in Bangkok Metropolis : a study on the vended food sanitation improvement policy. ม.ป.ท.:National Institute of Development Administration;Yinyon Seniwong Na Ayudhya และผู้แต่งคนอื่นๆ. Major factors influencing the healthy city policy implementation in Bangkok Metropolis : a study on the vended food sanitation improvement policy. ม.ป.ท.:National Institute of Development Administration, 2001. Print.