(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.