Cita APA (7a ed.)

Hellman, G. (1989). Mathematics without numbers: Towards a modal-structural interpretation. Clarendon.

Cita Chicago Style (17a ed.)

Hellman, Geoffrey. Mathematics Without Numbers: Towards a Modal-structural Interpretation. Oxford: Clarendon, 1989.

Cita MLA (9a ed.)

Hellman, Geoffrey. Mathematics Without Numbers: Towards a Modal-structural Interpretation. Clarendon, 1989.