Cita APA (7a ed.)

Bernal, J. D. (1949). The Freedom of necessity. Routledge & Kegan Paul.

Cita Chicago Style (17a ed.)

Bernal, J. D. The Freedom of Necessity. London: Routledge & Kegan Paul, 1949.

Cita MLA (9a ed.)

Bernal, J. D. The Freedom of Necessity. Routledge & Kegan Paul, 1949.