Department of Agriculture Northern Red-leggedFrog profile (2003) (PDF). [2008-10-22]. (原始内容 (PDF)存档于2009-08-21). Red-leggedFrog observations in the coastal
ISBN 0-691-10251-1. Daividson C, Shaffer HB, Jennings MR. Declines of the californiared-leggedfrog: climate, UV-B, habitat, and pesticides hypotheses. Ecological