APA (7th ed.) Citation

Cody, W. J., & Britton, D. M. (1989). Ferns and fern allies of Canada. Min. of Supply and Services Canada.

Chicago Style (17th ed.) Citation

Cody, William J., and Donald M. Britton. Ferns and Fern Allies of Canada. Ottawa: Min. of Supply and Services Canada, 1989.

MLA (9th ed.) Citation

Cody, William J., and Donald M. Britton. Ferns and Fern Allies of Canada. Min. of Supply and Services Canada, 1989.