Bibliography
- Herlitz, Eva & Klaus, Buddy Bear Berlin Show. NeptunArt Publisher, 2001. ISBN 3-85820-152-9.
- Herlitz, Eva & Klaus, United Buddy Bears — Die Kunst der Toleranz. Bostelmann & Siebenhaar Publishers, 2003. ISBN 3-936962-00-6.
- Herlitz, Eva & Klaus, United Buddy Bears — World Tour. NeptunArt Publisher, 2006. ISBN 3-85820-189-8.
- Herlitz, Eva & Klaus, United Buddy Bears — The Art of Tolerance. 384 pages, English/German, December 2009, ISBN 978-3-00-029417-4.
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