John A. Crawford, Donald B. Shepard and Christopher A. Conner. "Diet Composition and Overlap between Recently Metamorphosed Rana areolata and Rana sphenocephala: Implications for a Frog of Conservation Concern" Copeia Vol. 2009 Iss. 4 (2009) p. 642 - 646
Available at: http://works.bepress.com/don-shepard/14/