sack, k., & linsel, h. (1966). general organization of planning of industry (ed. 2.). National Planning Institute.
Chicago-referens (17:e uppl.)sack, kurt, och hermann linsel. General Organization of Planning of Industry. ed. 2. cairo: National Planning Institute, 1966.
MLA-referens (9:e uppl.)sack, kurt, och hermann linsel. General Organization of Planning of Industry. ed. 2. National Planning Institute, 1966.