Bibliotheken
- Bibliothek der Universität Weimar
- Deutsche Nationalbibliothek
- WorldCat.org - World Library Catalogue
Antiquariate
- addall (Used Books)
- zvab.com - Zentrales Verzeichnis antiquarischer Bücher
Buchhändler
Online-Suche
- addall (eBooks)
- Clusty Websearch
- Google Websearch
- Google Books
- isbndb - the imdb for isbn numbers!
- Open Library - One Page for every book
- tbnx - The Book eXchange Network
- WolframAlpha
Science Papers
- The ACM Digital Library - Association for Computing Machinery
- IEEE computer.org
// eg. Test-ISBN: 9783822822227