Robbins, Chandler S., John R. Sauer, Russell S. Greenberg, and Sam Droege. "Population Declines In North American Birds That Migrate to the Neotropics." Proceedings of the National Academy of Sciences of the United States of America 86, no. 19 (1989): 7658-7662.

Robbins, Chandler S., John R. Sauer, Russell S. Greenberg, and Sam Droege. Recent Declines In Populations of North American Birds That Migrate to the Neotropics., 1988.