Παραπομπή σε μορφή APA (7η εκδ.)

Engert, M. (1969). Problems of Long-term Planning in the German Democratic Republic. The Institute of National Planning.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Engert, Manfred. Problems of Long-term Planning in the German Democratic Republic. Cairo: The Institute of National Planning, 1969.

Παραπομπή σε μορφή MLA (9th εκδ.)

Engert, Manfred. Problems of Long-term Planning in the German Democratic Republic. The Institute of National Planning, 1969.