APA (7 वां संस्करण) प्रशस्ति पत्र

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

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

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

एमएलए (8वां संस्करण) प्रशस्ति पत्र

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