APA (7th ed.) Zitazioa

Horn, K. (1967). Long-term Planning. The Institute of National Planning.

Chicago Style (17th ed.) Zitazioa

Horn, Karl-Heinz. Long-term Planning. Cairo: The Institute of National Planning, 1967.

MLA (9th ed.) Zitazioa

Horn, Karl-Heinz. Long-term Planning. The Institute of National Planning, 1967.