एपीए उद्धरण

Robert Ludlum. (1996). The apocalypse watch. Harper Collins.

शिकागो स्टाइल उद्धरण

Robert Ludlum. The Apocalypse Watch. London: Harper Collins, 1996.

एमएलए उद्धरण

Robert Ludlum. The Apocalypse Watch. Harper Collins, 1996.