एपीए उद्धरण

Landon, C. (1957). Unseen enemy. Garden City, New York: Doubleday & Company.

शिकागो स्टाइल उद्धरण

Landon, Christopher. Unseen Enemy. Garden City, New York: Doubleday & Company, 1957.

एमएलए उद्धरण

Landon, Christopher. Unseen Enemy. Garden City, New York: Doubleday & Company, 1957.