Thomson, R. B., & Sifton, H. B. (1922). A guide to the poisonous plants and weed seeds of Canada and the northern United States. University of Toronto Press.
Chicago Style (17th ed.) CitationThomson, Robert Boyd, and Harold Boyd Sifton. A Guide to the Poisonous Plants and Weed Seeds of Canada and the Northern United States. Toronto: University of Toronto Press, 1922.
MLA (9th ed.) CitationThomson, Robert Boyd, and Harold Boyd Sifton. A Guide to the Poisonous Plants and Weed Seeds of Canada and the Northern United States. University of Toronto Press, 1922.
Warning: These citations may not always be 100% accurate.