Referensi

1. http://en.wikipedia.org/wiki/Ambigram
2. http://www.logopond.com
3. http://www.logomoose.com
4. http://www.logodesignlove.com
5. http://www.logodesignworks.com
6. http://www.logoease.com
7. http://www.logos.com
8. http://www.logoblog.org
9. http://www.logolove.com
10. http://www.logoyes.com
11. http://www.logoguru.co.uk
12. http://www.logotwo.com
13. http://www.thelogomix.com
14. http://www.thelogofactory.com
15. http://logofury.com
16. http://logofaves.com
17. http://blog.companylogos.ws
18. http://99designs.com
19. http://www.goodlogo.com
20. http://www.johnlangdon.net
21. http://pentagram.com
22. http://ambigram.com
23. http://www.ahlidesain.com