George Ilian. Top Visionaries Who Changed The World. Jaico Publishing House.
Chicago-referens (17:e uppl.)George Ilian. Top Visionaries Who Changed The World. Jaico Publishing House.
MLA-referens (9:e uppl.)George Ilian. Top Visionaries Who Changed The World. Jaico Publishing House.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.