Walter B. Hall2023-12-182023-12-182008http://portal.igpublish.com/iglibrary/obj/PMPHB0000014?searchid=1589298737336TxVQBzA0FmwX2LfJ1rS9Hhttps://libebook.kku.ac.th/handle/123456789/3969Critical decisions in periodontology Fourth edition