- Libro electrónicoSystematic Status of a South American Frog, Allophryne ruthveni GaigeHoward L. Freeman
- Libro electrónicoSystematic Status of a South American Frog, Allophryne ruthveni GaigeHoward L. Freeman
- Libro electrónicoSystematic Status of a South American Frog, Allophryne ruthveni GaigeJohn D. Lynch