Cita APA (7a ed.)

Ash, C. J., & Knight, J. (2006). Computable structures and the hyperarithmetical hierarchy. Elsevier.

Cita Chicago Style (17a ed.)

Ash, C. J., y J. Knight. Computable Structures and the Hyperarithmetical Hierarchy. Amsterdam [etc.]: Elsevier, 2006.

Cita MLA (9a ed.)

Ash, C. J., y J. Knight. Computable Structures and the Hyperarithmetical Hierarchy. Elsevier, 2006.