APA (7th ed.) Citation

Porsild, A. E., & Raup, H. M. (1943). Materials for a flora of the continental Northwest territories of Canada. The Arnold arboretum of Harvard university.

Chicago Style (17th ed.) Citation

Porsild, A. E., and Hugh M. Raup. Materials for a Flora of the Continental Northwest Territories of Canada. Jamaica Plain, Mass.: The Arnold arboretum of Harvard university, 1943.

MLA (9th ed.) Citation

Porsild, A. E., and Hugh M. Raup. Materials for a Flora of the Continental Northwest Territories of Canada. The Arnold arboretum of Harvard university, 1943.