Παραπομπή APA

Jeffreys, M. (1962). Personal values in the modern world. Penguin books.

Παραπομπή Chicago Style

Jeffreys, M.V.C. Personal Values in the Modern World. England: Penguin books, 1962.

Παραπομπή MLA

Jeffreys, M.V.C. Personal Values in the Modern World. Penguin books, 1962.