APA (7th ed.) Citation

Crawford, R. M. (2013). The reindeer botanist: Alf Erling Porsild, 1901–1977. Polar Research, 32(1), 21662.

Chicago Style (17th ed.) Citation

Crawford, Robert M.M. "The Reindeer Botanist: Alf Erling Porsild, 1901–1977." Polar Research 32, no. 1 (2013): 21662.

MLA (9th ed.) Citation

Crawford, Robert M.M. "The Reindeer Botanist: Alf Erling Porsild, 1901–1977." Polar Research, vol. 32, no. 1, 2013, p. 21662.