एपीए उद्धरण

Porterfield, J. D. Community Health in United in the United states. Voice of America.

शिकागो स्टाइल उद्धरण

Porterfield, John D. Community Health in United in the United States. New York: Voice of America.

एमएलए उद्धरण

Porterfield, John D. Community Health in United in the United States. Voice of America.