Isard, W., & Cumberland, J. (1960). Regional Economic Pianning. Techniques of Analysis for less developed areas: наукове видання.
Lua i Stíl Chicago (17ú heag.)Isard, Walter, agus JohnH Cumberland. Regional Economic Pianning. Techniques of Analysis for Less Developed Areas: наукове видання. 1960.
Lua MLA (9ú heag.)Isard, Walter, agus JohnH Cumberland. Regional Economic Pianning. Techniques of Analysis for Less Developed Areas: наукове видання. 1960.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.