Mark, B. H., & Osborne, A. S. (2014). Worthy of the calling: Biographies of Paul and Lela Hostetler, Harvey and Erma Sider, Luke Jr. and Doris Keefer. Brethren in Christ Historical Society.
Chicago-referens (17:e uppl.)Mark, Beth Hostetler, och AnnaRuth Sider Osborne. Worthy of the Calling: Biographies of Paul and Lela Hostetler, Harvey and Erma Sider, Luke Jr. and Doris Keefer. Mechanisburg, PA: Brethren in Christ Historical Society, 2014.
MLA-referens (9:e uppl.)Mark, Beth Hostetler, och AnnaRuth Sider Osborne. Worthy of the Calling: Biographies of Paul and Lela Hostetler, Harvey and Erma Sider, Luke Jr. and Doris Keefer. Brethren in Christ Historical Society, 2014.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.