linsel, H., & sack, K. (1965). theoretical problems of industrial planning. National Planning Institute.
Lua i Stíl Chicago (17ú heag.)linsel, H., agus K. sack. Theoretical Problems of Industrial Planning. cairo: National Planning Institute, 1965.
Lua MLA (9ú heag.)linsel, H., agus K. sack. Theoretical Problems of Industrial Planning. National Planning Institute, 1965.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.