Reference citation:
Beal, F. E. L. 1918. Food habits of the swallows, a family of valuable native birds. U.S. Department of Agriculture, Bulletin 619.

Source citation:
Allen Hurlbert. 2017. Avian Diet Database.

Source archive URL:
https://github.com/Dryu0003/dietdatabase/archive/bbd9be71f5db476449b66d948e4938dce5900300.zip