Lua APA (7ú heag.)

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

Lua i Stíl Chicago (17ú heag.)

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

Lua MLA (9ú heag.)

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

Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.