Cita APA (7th ed.)

(1971). People helping people: U.S. volunteers in action. Books by U.S. News & World Report.

Cita Chicago (17th ed.)

People Helping People: U.S. Volunteers in Action. Washington: Books by U.S. News & World Report, 1971.

Cita MLA (9th ed.)

People Helping People: U.S. Volunteers in Action. Books by U.S. News & World Report, 1971.

Atenció: Aquestes cites poden no estar 100% correctes.