Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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