horn, k. h. (1967). structural changes and productivity. the institute of national planning.
Cita Chicago (17th ed.)horn, karl heinz. Structural Changes and Productivity. cairo: the institute of national planning, 1967.
Cita MLA (9th ed.)horn, karl heinz. Structural Changes and Productivity. the institute of national planning, 1967.
Atenció: Aquestes cites poden no estar 100% correctes.