Cita APA (7th ed.)

Horn, K. H. (1967). Productivity , Concepts and Measurement. The Institute of National Planning.

Cita Chicago (17th ed.)

Horn, Karl Heinz. Productivity , Concepts and Measurement. Cairo: The Institute of National Planning, 1967.

Cita MLA (9th ed.)

Horn, Karl Heinz. Productivity , Concepts and Measurement. The Institute of National Planning, 1967.

Atenció: Aquestes cites poden no estar 100% correctes.