Thailand. Krom Songsœ̄m Khunnaphāp Singwǣtlō̜m. (2004). Saphan Seekhieo: The green bridge : towards practical environmental education. Department of Environmental Quality Promotion, Ministry of Science, Technology and Environment.
Cytowanie według stylu Chicago (wyd. 17)Thailand. Krom Songsœ̄m Khunnaphāp Singwǣtlō̜m. Saphan Seekhieo: The Green Bridge : Towards Practical Environmental Education. Bangkok: Department of Environmental Quality Promotion, Ministry of Science, Technology and Environment, 2004.
Cytowanie według stylu MLA (wyd. 8)Thailand. Krom Songsœ̄m Khunnaphāp Singwǣtlō̜m. Saphan Seekhieo: The Green Bridge : Towards Practical Environmental Education. Department of Environmental Quality Promotion, Ministry of Science, Technology and Environment, 2004.
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