http://books.ppublishing.org/ 2026-02-16T16:40:14+00:00 http://books.ppublishing.org/page1766759.html 2019-12-26T03:36:25+00:00 http://books.ppublishing.org/en 2026-02-16T16:43:35+00:00 http://books.ppublishing.org/en/publishing-ethics/ 2019-12-26T03:36:34+00:00