De Ville, J. (1996). The psychology of witnessing. Ministerial Association. General Conference of Seventh-Day Adventists.
Lua i Stíl Chicago (17ú heag.)De Ville, Jard. The Psychology of Witnessing. Ministerial Association. General Conference of Seventh-Day Adventists, 1996.
Lua MLA (9ú heag.)De Ville, Jard. The Psychology of Witnessing. Ministerial Association. General Conference of Seventh-Day Adventists, 1996.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.