Wasinrat Nualsiri. 2006. Ecological awareness in John Steinbeck's novelsWasinrat Nualsiri. Field of Study English, Chulalongkorn University;
Wasinrat Nualsiri. (2006) Ecological awareness in John Steinbeck's novelsWasinrat Nualsiri . Chulalongkorn University/Bangkok.
Wasinrat Nualsiri. Ecological awareness in John Steinbeck's novelsWasinrat Nualsiri. . Bangkok:Chulalongkorn University, 2006.
Wasinrat Nualsiri. (2006) Ecological awareness in John Steinbeck's novelsWasinrat Nualsiri . Chulalongkorn University/Bangkok.