Panitanung, Sirikanya, and Somkiat Tanok. 2014. “A Study of Science Learning Unit Development of the Teacher under Nakhon Ratchasima Provincial Administrative Organization”. Ratchaphruek Journal 12 (2):77-84. https://so05.tci-thaijo.org/index.php/Ratchaphruekjournal/article/view/240670.