References
Burger, J., and M. Gochfeld. 1994. Franklin's Gull (Larus pipixcan). In The Birds of North America, No. 116 (A. Poole and F. Gill, Eds.). Philadelphia: The Academy of Natural Sciences; Washington, D.C.: The American Ornithologists' Union.
Burger, J., and M. Gochfeld. 1994. Franklin's Gull (Larus pipixcan). In The Birds of North America, No. 116 (A. Poole and F. Gill, Eds.). Philadelphia: The Academy of Natural Sciences; Washington, D.C.: The American Ornithologists' Union.