एपीए उद्धरण

(1991). Postprincipia: Gravitation for physicists and astronomers. Singapore: World Scientific.

शिकागो स्टाइल उद्धरण

Postprincipia: Gravitation for Physicists and Astronomers. Singapore: World Scientific, 1991.

एमएलए उद्धरण

Postprincipia: Gravitation for Physicists and Astronomers. Singapore: World Scientific, 1991.