एपीए उद्धरण

Kummel, B. (1961). History of the earth: :introduction to histrocal geology. Eurasia publishing.

शिकागो स्टाइल उद्धरण

Kummel, Bernhard. History of the Earth: :introduction to Histrocal Geology. New delhi: Eurasia publishing, 1961.

एमएलए उद्धरण

Kummel, Bernhard. History of the Earth: :introduction to Histrocal Geology. Eurasia publishing, 1961.