linsel, h., & sack, k. (1965). theoretical problems of industrial planning. the institute of national planning.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रlinsel, h., और k. sack. Theoretical Problems of Industrial Planning. cairo: the institute of national planning, 1965.
एमएलए (9वां संस्करण) प्रशस्ति पत्रlinsel, h., और k. sack. Theoretical Problems of Industrial Planning. the institute of national planning, 1965.