https://www.curteaveche.ro/p/atitudinea-este-totul
Atitudinea este totul Editia a V-a ➤ autor Jeff Keller ➜ Achiziționează cartea de pe Curteaveche.ro ➤ Prețuri avantajoase ✅ Livrare rapidă în...
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https://harpercollins.co.in/author-details/jeff-keller/
Jeff Keller, President of Attitude is Everything, Inc., works with organizations that want to develop achievers and with people who want to reach their full...
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https://www.popphoto.com/authors/jeff-keller/
Jeff Keller is an experienced writer for PopPhoto, covering the latest photography gear reviews, news and how-tos.
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