APA (7th ed.) Citation

Afshari, B., Barmpalias, G., Cooper, S., & Stephan, F. (2007). Post's programme for the Ershov hierarchy.

Chicago Style (17th ed.) Citation

Afshari, B., G. Barmpalias, S. Cooper, and F. Stephan. Post's Programme for the Ershov Hierarchy. 2007.

MLA (9th ed.) Citation

Afshari, B., et al. Post's Programme for the Ershov Hierarchy. 2007.