Free Library of Philadelphia. (1961). Decade of growth: 1951-1960.
Cita Chicago (17th ed.)Free Library of Philadelphia. Decade of Growth: 1951-1960. Philadelphia, 1961.
Cita MLA (8th ed.)Free Library of Philadelphia. Decade of Growth: 1951-1960. 1961.
Atenció: Aquestes cites poden no estar 100% correctes.