एपीए उद्धरण

Berle, A. K., & Camp, L. S. d. (1959). Inventions, patents, and their management. D. Van nostrand company.

शिकागो स्टाइल उद्धरण

Berle, Alf K., और L. Sprague de Camp. Inventions, Patents, and Their Management. London: D. Van nostrand company, 1959.

एमएलए उद्धरण

Berle, Alf K., और L. Sprague de Camp. Inventions, Patents, and Their Management. D. Van nostrand company, 1959.