Cita APA (7a ed.)

Hughes, G. E. 1. a., & Londey, D. G. (1965). The Elements Of Formal Logic. University Paperbacks.

Cita Chicago Style (17a ed.)

Hughes, G. E. 1918- autor, y D. G. Londey. The Elements Of Formal Logic. London: University Paperbacks, 1965.

Cita MLA (9a ed.)

Hughes, G. E. 1918- autor, y D. G. Londey. The Elements Of Formal Logic. University Paperbacks, 1965.