Patwary และ Kabir Hossain. (2006) Ecotourism development at Khao Phaeng Ma, Nakhon Ratchasima province, Northeast of Thailand /. Kasetsart University,:ม.ป.ท.Patwary และ Kabir Hossain. 2006. Ecotourism development at Khao Phaeng Ma, Nakhon Ratchasima province, Northeast of Thailand /. ม.ป.ท.:Kasetsart University,;Patwary และ Kabir Hossain. Ecotourism development at Khao Phaeng Ma, Nakhon Ratchasima province, Northeast of Thailand /. ม.ป.ท.:Kasetsart University, 2006. Print.