Παραπομπή APA

Hagen, E. E. (1962). On the theroy of social change. Vakils, Feffer and Simons.

Παραπομπή Chicago Style

Hagen, Evertt E. On the Theroy of Social Change. Bombay: Vakils, Feffer and Simons, 1962.

Παραπομπή MLA

Hagen, Evertt E. On the Theroy of Social Change. Vakils, Feffer and Simons, 1962.