Pongpan Leelahakriengkrai. 2011. Diversity of benthic diatoms in main rivers of Thailand and preparation of water quaility index. Field of Study Environmental Science, Chiang Mai University;
Pongpan Leelahakriengkrai. (2011) Diversity of benthic diatoms in main rivers of Thailand and preparation of water quaility index . Chiang Mai University/Chiang Mai.
Pongpan Leelahakriengkrai. Diversity of benthic diatoms in main rivers of Thailand and preparation of water quaility index. . Chiang Mai:Chiang Mai University, 2011.
Pongpan Leelahakriengkrai. (2011) Diversity of benthic diatoms in main rivers of Thailand and preparation of water quaility index . Chiang Mai University/Chiang Mai.