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