Purity resource book, [s.d.]

[description english/roman)] Purity resource book, a supplement to the Purity guide, with an introduction by Thelma E Cotton, Church of God in Christ, [s.d.].《纯净资源手册》是《纯净指南》（Purity guide）的补充配套资料，由基督上帝教会（Church of God in Christ）的塞尔玛·E·科顿（Thelma E Cotton）撰写序言，无明确出版年份。