Παραπομπή APA

Van Loon, H. W. (1922). Story of mankind. George G Harrap.

Παραπομπή Chicago Style

Van Loon, Hendrick Willem. Story of Mankind. London: George G Harrap, 1922.

Παραπομπή MLA

Van Loon, Hendrick Willem. Story of Mankind. George G Harrap, 1922.