Cita APA (7th ed.)

Sacks, G. E. (1966). Degrees of unsolvability (2a. ed.). Princeton University.

Cita Chicago (17th ed.)

Sacks, Gerald E. Degrees of Unsolvability. 2a. ed. Princeton: Princeton University, 1966.

Cita MLA (9th ed.)

Sacks, Gerald E. Degrees of Unsolvability. 2a. ed. Princeton University, 1966.