Epstein, T. S., & Penny, D. H. (1972). Opportunity and response: Case studies in economic development. C. Hurst.
Lua i Stíl Chicago (17ú heag.)Epstein, T. Scarlett, agus David Harry Penny. Opportunity and Response: Case Studies in Economic Development. London,: C. Hurst, 1972.
Lua MLA (8ú heag.)Epstein, T. Scarlett, agus David Harry Penny. Opportunity and Response: Case Studies in Economic Development. C. Hurst, 1972.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.