Norton, R. (2005). Evangelism: Principles and practice. Kerygma.
Lua i Stíl Chicago (17ú heag.)Norton, Ricardo. Evangelism: Principles and Practice. Berrien Springs: Kerygma, 2005.
Lua MLA (9ú heag.)Norton, Ricardo. Evangelism: Principles and Practice. Kerygma, 2005.
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