คณะสาธารณสุขศาสตร์ MASTER OF SCIENCE PROGRAM IN ENVIRONMENTAL TECHNOLOGY WILLINGNESS TO PAY (WTP) FOR BIOPLASTIC CUP PACKAGING AMONG CAFE ENTREPRENEURS IN BANGKOK METROPOLIS AND VICINITY [ 2566 ] AUTHOR: PATTIRA PHANIL ADVISOR: Associate Professor Dr. SOPA CHINWETKITVANICH