APA (7e ed.) Bronvermelding

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

Chicago (17e ed.) Bronvermelding

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

MLA (9e ed.) Bronvermelding

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

Let op: Deze citaties zijn niet altijd 100% accuraat.