This is in Spanish.

This is in Hebrew.

This is in English.

Virginia has been looking at two books for Library Usability:

1. Usability Testing for Library Websites, by Elaina Norlin
2. Making Library Web Sites Usable, by Tom Lehman and Terry Nikkel

Usability Testing for Library Websites was published in 2002, so while its concepts are sound, it is a bit outdated.