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Die Büro-Bibel : Auftritt, Organisation, Kommunikation
Cerwinka, Gabriele, (2008)
The attractor factor : 5 easy steps for creating wealth (or anything else) from the inside out
Vitale, Joseph G., (2005)
Briefing the team : a guide to better briefing for clients
(1997)
Solving skills shortages : how to recruit and retain skilled people
Catt, Hilton, (1997)