1. Recreation and bald eagles in the Pacific Northwest;Anthony,1995
2. Situación actual y problemas de conservación de Rana patilarga en la Comunidad Autónoma de Madrid;Ayllón;Boletín SCV,2001
3. Chicken little or Nero’s fiddle: a perspective on declining amphibian populations;Blaustein;Herpetologica,1994
4. Complexity in conservation: lessons from the global decline of amphibian populations;Blaustein;Ecology Letters,2002
5. Declining amphibian populations: a global phenomenon;Blaustein;Trends in Ecology and Evolution,1990