linsel, H., & sack, K. (1965). theoretical problems of industrial planning. National Planning Institute.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रlinsel, H., और K. sack. Theoretical Problems of Industrial Planning. cairo: National Planning Institute, 1965.
एमएलए (9वां संस्करण) प्रशस्ति पत्रlinsel, H., और K. sack. Theoretical Problems of Industrial Planning. National Planning Institute, 1965.