Afshari, B., Barmpalias, G., Cooper, S., & Stephan, F. (2007). Post's programme for the Ershov hierarchy.
Chicagoスタイル(17版)引用形式Afshari, B., G. Barmpalias, S. Cooper, , F. Stephan. Post's Programme for the Ershov Hierarchy. 2007.
MLA(9版)引用形式Afshari, B., et al. Post's Programme for the Ershov Hierarchy. 2007.
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