Cita APA (7th ed.)

Hilbert, D., & Ackerman, W. (1950). Principles of mathematical logic. Chelsea.

Cita Chicago (17th ed.)

Hilbert, David, i W. Ackerman. Principles of Mathematical Logic. Nueva York: Chelsea, 1950.

Cita MLA (9th ed.)

Hilbert, David, i W. Ackerman. Principles of Mathematical Logic. Chelsea, 1950.