एपीए उद्धरण

Garraty John A. University history of the world. Orchard editions ltd.

शिकागो स्टाइल उद्धरण

Garraty John A. University History of the World. UK: Orchard editions ltd.

एमएलए उद्धरण

Garraty John A. University History of the World. Orchard editions ltd.