APA (7th ed.) Citation

Seymour, S., & Shepherdson, D. (1991). Puzzle feeder for orang utans. Universities Federation for Animal Welfare.

Chicago Style (17th ed.) Citation

Seymour, Sarah, and David Shepherdson. Puzzle Feeder for Orang Utans. Potters Bar [England]: Universities Federation for Animal Welfare, 1991.

MLA (9th ed.) Citation

Seymour, Sarah, and David Shepherdson. Puzzle Feeder for Orang Utans. Universities Federation for Animal Welfare, 1991.