एपीए उद्धरण

Spengler, J. J., & Duncan, O. D. (1956). Population theory and policy: Selected readings.

शिकागो स्टाइल उद्धरण

Spengler, Joseph J., और Otis Dudley Duncan. Population Theory and Policy: Selected Readings. 1956.

एमएलए उद्धरण

Spengler, Joseph J., और Otis Dudley Duncan. Population Theory and Policy: Selected Readings. 1956.