APA (7th ed.) Citation

Distribution and abundance of Least Bell's Vireos (Vireo bellii pusillus) and Southwestern Willow Flycatchers (Empidonax traillii extimus) on the Middle San Luis Rey River, San Diego County, southern California: ... data summary. U.S. Department of the Interior, U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Distribution and Abundance of Least Bell's Vireos (Vireo Bellii Pusillus) and Southwestern Willow Flycatchers (Empidonax Traillii Extimus) on the Middle San Luis Rey River, San Diego County, Southern California: ... Data Summary. Reston, Virginia: U.S. Department of the Interior, U.S. Geological Survey.

MLA (9th ed.) Citation

Distribution and Abundance of Least Bell's Vireos (Vireo Bellii Pusillus) and Southwestern Willow Flycatchers (Empidonax Traillii Extimus) on the Middle San Luis Rey River, San Diego County, Southern California: ... Data Summary. U.S. Department of the Interior, U.S. Geological Survey.