Hartmann, W. (2011). Anno II of Cologne. Religion Past and Present online. doi:10.1163/1877-5888_rpp_SIM_00747
芝加哥风格引文Hartmann, Wilfried. "Anno II of Cologne." Religion Past and Present Online 2011, https://doi.org/10.1163/1877-5888_rpp_SIM_00747.
MLA引文Hartmann, Wilfried. "Anno II of Cologne." Religion Past and Present Online, 2011, https://doi.org/10.1163/1877-5888_rpp_SIM_00747.
警告：这些引文格式不一定是100％准确.