एपीए उद्धरण

Willock, C. (1974). Africa's rift valley. Time-Life Books.

शिकागो स्टाइल उद्धरण

Willock, Colin. Africa's Rift Valley. Amsterdam: Time-Life Books, 1974.

एमएलए उद्धरण

Willock, Colin. Africa's Rift Valley. Time-Life Books, 1974.