Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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