engert, m. (1964). structural problems of industry. the institute of national planning.
Cita Chicago (17th ed.)engert, m. Structural Problems of Industry. cairo: the institute of national planning, 1964.
Cita MLA (9th ed.)engert, m. Structural Problems of Industry. the institute of national planning, 1964.
Atenció: Aquestes cites poden no estar 100% correctes.