Παραπομπή APA

Bettger, F. (1977). How I multiplied my income and. Universal.

Παραπομπή Chicago Style

Bettger, Frank. How I Multiplied My Income and. New Delhi: Universal, 1977.

Παραπομπή MLA

Bettger, Frank. How I Multiplied My Income and. Universal, 1977.