Cita APA (7a ed.)

Helm, F. C. (1968). The economics of cooperative enterprise. University Press [etc.].

Cita Chicago Style (17a ed.)

Helm, Franz C. The Economics of Cooperative Enterprise. London [etc.]: University Press [etc.], 1968.

Cita MLA (9a ed.)

Helm, Franz C. The Economics of Cooperative Enterprise. University Press [etc.], 1968.