Cita APA

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

Citación estilo Chicago

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

Cita MLA

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