Nelson, Edward William.
1887. Report upon natural history collections made in Alaska between the years 1877 and 1881. U. S. Signal Service, Arctic ser., no. 3.
Newberry, John Strong.
1857. Report upon the zoology of the route. U. S. Pacific Railroad Reports, vol. 6, pt. 4, pp. 35-110.
Norris, Joseph Parker.
1888. Five sets of eggs from one bird in one season. Ornithologist and Oologist, vol. 13, p. 102.
Nuttall, Thomas.
1832. A manual of the ornithology of the United States and of Canada, vol. 1. Land birds.
Nye, Harriet Augusta.
1918. The sapsucker wintering in central Maine. Auk, vol. 35, pp. 353-354.