แก้วศรี ประสิทธิ์. 2023. “SELF-DEVELOPMENT ACCORDING TO THE FOUR BHÃVANÃS OF THE VAJIRA ELDERLY CLUB FACULTY OF MEDICINE VAJIRA HOSPITAL, NAVAMINDRADHIRAJ UNIVERSITY”. Journal of MCU Languages and Cultures 3 (1). Phra Nakhon Si Ayutthaya, Thailand:1-14. https://so08.tci-thaijo.org/index.php/JMLC/article/view/658.