एपीए उद्धरण

M.Hurley Patrick. (1959). How old is the earth? Columbus: Anchor Book.

शिकागो स्टाइल उद्धरण

M.Hurley Patrick. How Old Is the Earth? Columbus: Anchor Book, 1959.

एमएलए उद्धरण

M.Hurley Patrick. How Old Is the Earth? Columbus: Anchor Book, 1959.