Moldenhauer, R. R., and D. J. Regelski. 1996. Northern Parula (Parula americana). In The Birds of North America, No. 215 (A. Poole and F. Gill, eds.). The Academy of Natural Sciences, Philadelphia, PA, and The American Ornithologists’ Union, Washington, D.C.
Byrd, Elon E.; Denton, Fred (August 1949). "The Helminth Parasites of Birds. II. A New Species of Acanthocephala from North American Birds". The Journal of Parasitology. 35 (4): 391–410. doi:10.2307/3273430. JSTOR3273430. PMID18133320.
Byrd, Elon E.; Denton, Fred (August 1949). "The Helminth Parasites of Birds. II. A New Species of Acanthocephala from North American Birds". The Journal of Parasitology. 35 (4): 391–410. doi:10.2307/3273430. JSTOR3273430. PMID18133320.
nih.gov
pubmed.ncbi.nlm.nih.gov
Byrd, Elon E.; Denton, Fred (August 1949). "The Helminth Parasites of Birds. II. A New Species of Acanthocephala from North American Birds". The Journal of Parasitology. 35 (4): 391–410. doi:10.2307/3273430. JSTOR3273430. PMID18133320.