Ruddies, H. (2011). Keller, Adolf. Religion Past and Present online. doi:10.1163/1877-5888_rpp_SIM_11465
Chicago Style (17th ed.) CitationRuddies, Hartmut. "Keller, Adolf." Religion Past and Present Online 2011, https://doi.org/10.1163/1877-5888_rpp_SIM_11465.
MLA (8th ed.) CitationRuddies, Hartmut. "Keller, Adolf." Religion Past and Present Online, 2011, https://doi.org/10.1163/1877-5888_rpp_SIM_11465.
Warning: These citations may not always be 100% accurate.