Cita APA (7a ed.)

Walker, J. D. (1965). A study of Frege. Blackwell.

Cita Chicago Style (17a ed.)

Walker, Jeremy D.B. A Study of Frege. Oxford: Blackwell, 1965.

Cita MLA (9a ed.)

Walker, Jeremy D.B. A Study of Frege. Blackwell, 1965.