Amazon has a new "citations" feature for academic books. If the book is one for which "Search inside this book" is enabled, Amazon will tell you what other books are cited by the given book, and also what other books (with "Search inside" enabled) cite the given book.

For example, take the Amazon page for one of my favorite philosophy books, On the Plurality of Worlds, by David Lewis. In the citations section, we see that this book cites 29 other books in Amazon's catalog, including The Shape of Space, by Graham Nerlich, and Science without Numbers, by Hartry Field. There are 120 books in the Amazon catalog that cite Plurality, such as Supervenience and Mind, by Jaegwon Kim. There are even links to images of the pages where the citations occur.

It's trackback for books!

(þ Brad DeLong.)