Cita APA (7th ed.)

Epstein, R. L. (1979). Degrees of unsolvability: Structure and theory. Springer-Verlag.

Cita Chicago (17th ed.)

Epstein, Richard L. Degrees of Unsolvability: Structure and Theory. Berlín: Springer-Verlag, 1979.

Cita MLA (9th ed.)

Epstein, Richard L. Degrees of Unsolvability: Structure and Theory. Springer-Verlag, 1979.