APA (7th ed.) Citation

Clausen, H., & Ipsen, E. J. (1970). Farm animals in colour. Blandford P.

Chicago Style (17th ed.) Citation

Clausen, H., and E. J. Ipsen. Farm Animals in Colour. London: Blandford P, 1970.

MLA (9th ed.) Citation

Clausen, H., and E. J. Ipsen. Farm Animals in Colour. Blandford P, 1970.