APA (7th ed.) Citation

Zahradník, J., & Čihař, J. (1979). A field guide in color to The animal world. Octopus.

Chicago Style (17th ed.) Citation

Zahradník, Jiří, and Jiří Čihař. A Field Guide in Color to The Animal World. London: Octopus, 1979.

MLA (9th ed.) Citation

Zahradník, Jiří, and Jiří Čihař. A Field Guide in Color to The Animal World. Octopus, 1979.