APA (7th ed.) Citation

Howell, S. L., & Kus, B. E. (2021). Distribution and abundance of southwestern willow flycatchers (Empidonax traillii extimus) on the upper San Luis Rey River, San Diego County--2020 data summary. U.S. Department of the Interior, U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Howell, Scarlett L., and Barbara Elaine Kus. Distribution and Abundance of Southwestern Willow Flycatchers (Empidonax Traillii Extimus) on the Upper San Luis Rey River, San Diego County--2020 Data Summary. Reston, Virginia: U.S. Department of the Interior, U.S. Geological Survey, 2021.

MLA (9th ed.) Citation

Howell, Scarlett L., and Barbara Elaine Kus. Distribution and Abundance of Southwestern Willow Flycatchers (Empidonax Traillii Extimus) on the Upper San Luis Rey River, San Diego County--2020 Data Summary. U.S. Department of the Interior, U.S. Geological Survey, 2021.