Cita APA (7a ed.)

Houghton, G. E. (1937). The foundations of economics. Staples [etc.].

Cita Chicago Style (17a ed.)

Houghton, G. E. The Foundations of Economics. London: Staples [etc.], 1937.

Cita MLA (9a ed.)

Houghton, G. E. The Foundations of Economics. Staples [etc.], 1937.