In the USA:

• Amphibians: The World of Frogs, Toads, Salamanders and Newts
• Biology of Amphibians
• Environmental Physiology of the Amphibians
• Herpetology
• Frogs, Toads, Lizards and Salamanders

In the UK:

• Amphibians: The World of Frogs, Toads, Salamanders and Newts
• A Natural History of Amphibians
• Herpetology
• New Naturalist: Reptiles and Amphibians
• DK Handbook: Reptiles & Amphibians
• How to Photograph Reptiles & Amphibians
• A Basic Book of Amphibians Look-and-learn