Empidonax traillii extimus
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Sanchez, J. 2016. Monitoring activity for listed species at Bosque del Apache National Wildlife Refuge. U.S. Fish and Wildlife Service.
Griffin, D.J. 2016. Results of Southwestern Willow Flycatcher and Yellow-Billed Cuckoo surveys in New Mexico. Griffin Biological Services.
SWCA Environmental Consultants. 2012. Spreadsheet of Southwestern willow flycatcher (Empidonax traillii extimus) observations. Annual report submitted to U.S. Fish and Wildlife Service, Section 10 TE-028605-0.
Hawks Aloft, Inc. 2006. Willow Flycatcher surveys at Bluewater Canyon, Lost Valley, and San Ysidro, New Mexico.
Smith, A, P. Dockens, A. Tudor, H. English, and B. Allen. 2003. Southwestern willow flycatcher 2003 survey and nest monitoring report. Technical Report 233, Nongame and Endangered Wildlife Program, Arizona Game and Fish Department, Phoenix, AZ.. 73 p.