APA-referens (7:e uppl.)

Epstein, T. S., & Penny, D. H. (1972). Opportunity and response: Case studies in economic development. C. Hurst.

Chicago-referens (17:e uppl.)

Epstein, T. Scarlett, och David Harry Penny. Opportunity and Response: Case Studies in Economic Development. London,: C. Hurst, 1972.

MLA-referens (8:e uppl.)

Epstein, T. Scarlett, och David Harry Penny. Opportunity and Response: Case Studies in Economic Development. C. Hurst, 1972.