APA (7th ed.) Citation

Layberry, R. A., Hall, P. W., & Lafontaine, J. D. (1998). The butterflies of Canada. University of Toronto Press.

Chicago Style (17th ed.) Citation

Layberry, Ross A., Peter W. Hall, and J. Donald Lafontaine. The Butterflies of Canada. Toronto [Ontario] ; Buffalo [New York]: University of Toronto Press, 1998.

MLA (8th ed.) Citation

Layberry, Ross A., et al. The Butterflies of Canada. University of Toronto Press, 1998.