Honours
Book sources - Wikipedia
https://en.wikipedia.org/wiki/Special:BookSources/978-3-8440-4315-0Book sources - Wikipedia
https://en.wikipedia.org/wiki/Special:BookSources/978-3-8440-4669-4Book sources - Wikipedia
https://en.wikipedia.org/wiki/Special:BookSources/978-3-8440-4429-4ISBN - Wikipedia
https://en.wikipedia.org/wiki/ISBN_(identifier)