Punnanan C. NINE KEYS PHILOSOPHY FOR HUMAN RESOURCE DEVELOPMENT BY PALANGJIT DHAMMA JAKRAWAN INSTITUTE. JMND [Internet]. 2020 May 20 [cited 2024 May 7];7(5):12-20. Available from: https://so03.tci-thaijo.org/index.php/JMND/article/view/243116