Meier, F. (2009). Hellmut Ritter. Der Islam, 48(2), 193-205. doi:10.1515/islm.1971.48.2.193
芝加哥风格引文Meier, Fritz. "Hellmut Ritter." Der Islam 48, no. 2 (2009): 193-205, https://doi.org/10.1515/islm.1971.48.2.193.
MLA引文Meier, Fritz. "Hellmut Ritter." Der Islam, vol. 48, no. 2, 2009, pp. 193-205, https://doi.org/10.1515/islm.1971.48.2.193.
警告：这些引文格式不一定是100％准确.
