APA (7 वां संस्करण) प्रशस्ति पत्र

Behrens, W. (1991). Manual for the preparation of industrial feasibility studies. UNIDO.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Behrens, W. Manual for the Preparation of Industrial Feasibility Studies. Vienna: UNIDO, 1991.

एमएलए (9वां संस्करण) प्रशस्ति पत्र

Behrens, W. Manual for the Preparation of Industrial Feasibility Studies. UNIDO, 1991.