Παραπομπή APA

Cummings gordan. (1963). Investment/7e (7th ed.). Penguin books.

Παραπομπή Chicago Style

Cummings gordan. Investment/7e. 7th ed. Asstralia: Penguin books, 1963.

Παραπομπή MLA

Cummings gordan. Investment/7e. 7th ed. Penguin books, 1963.