Sachs , I. (1964). Planning and Economic Development. PWN.
Cita Chicago (17th ed.)Sachs , Ignacy. Planning and Economic Development. Warsaw: PWN, 1964.
Cita MLA (9th ed.)Sachs , Ignacy. Planning and Economic Development. PWN, 1964.
Atenció: Aquestes cites poden no estar 100% correctes.