Afshari, B., Barmpalias, G., Cooper, S., & Stephan, F. (2007). Post's programme for the Ershov hierarchy.
芝加哥风格引文Afshari, B., G. Barmpalias, S. Cooper, 与 F. Stephan. Post's Programme for the Ershov Hierarchy. 2007.
MLA引文Afshari, B., et al. Post's Programme for the Ershov Hierarchy. 2007.
警告：这些引文格式不一定是100％准确.