Wilailak Ratanapeantamma. 2000. The appropriate environmental education model for the elementary schools in Bangkok Metropolis. Faculty of Graduate Studies, Mahidol University;
Wilailak Ratanapeantamma. (2000) The appropriate environmental education model for the elementary schools in Bangkok Metropolis . Mahidol University/Bangkok.
Wilailak Ratanapeantamma. The appropriate environmental education model for the elementary schools in Bangkok Metropolis. . Bangkok:Mahidol University, 2000.
Wilailak Ratanapeantamma. (2000) The appropriate environmental education model for the elementary schools in Bangkok Metropolis . Mahidol University/Bangkok.