Sriphyong, C., and S. Siewwuttanagul. “THE COMPARISON OF SERVICE WAITING TIME PRE AND DURING COVID-19 SITUATION: THE CASE STUDY OF THE OPHTHALMIC DEPARTMENT OF METTA PRACHARAK HOSPITAL (WAT RAI KHING)”. Research Community and Social Development Journal, vol. 16, no. 4, Dec. 2022, pp. 231-42, doi:10.14456/nrru-rdi.2022.78.