APA-Zitierstil (7. Ausg.)

Porsild, A. E., Raup, H. M., Porsild, A. E., & Raup, H. M. (1943). Materials for a flora of the continental northwest territories of Canada: With four plates. Arnold Arboretum of Harvard Univ.

Chicago-Zitierstil (17. Ausg.)

Porsild, A. E., Hugh Miller Raup, A. E. Porsild, und Hugh M. Raup. Materials for a Flora of the Continental Northwest Territories of Canada: With Four Plates. Jamaica Plain, Mass: Arnold Arboretum of Harvard Univ, 1943.

MLA-Zitierstil (9. Ausg.)

Porsild, A. E., et al. Materials for a Flora of the Continental Northwest Territories of Canada: With Four Plates. Arnold Arboretum of Harvard Univ, 1943.