APA-referens (7:e uppl.)

Spurr, S. H. (1963). Growth of Douglas fir in New Zealand. New Zealand Forest Service.

Chicago-referens (17:e uppl.)

Spurr, Stephen Hopkins. Growth of Douglas Fir in New Zealand. Wellington: New Zealand Forest Service, 1963.

MLA-referens (8:e uppl.)

Spurr, Stephen Hopkins. Growth of Douglas Fir in New Zealand. New Zealand Forest Service, 1963.