Παραπομπή APA

Barker, E. (1989). Political thought: From herbert spencer to the present day. Printwell.

Παραπομπή Chicago Style

Barker, Ernest. Political Thought: From Herbert Spencer to the Present Day. Jaipur: Printwell, 1989.

Παραπομπή MLA

Barker, Ernest. Political Thought: From Herbert Spencer to the Present Day. Printwell, 1989.