All 2 Wolfgang Maderthaner releases on Book, Paperba... Book
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![Cover for Wolfgang Maderthaner · Der Kunden-Manager: Das Erfolgskonzept Im Verdrangungswettbewerb (Paperback Book) [1991 edition] (2013)](https://imusic.b-cdn.net/images/item/original/146/9783663096146.jpg?wolfgang-maderthaner-2013-der-kunden-manager-das-erfolgskonzept-im-verdrangungswettbewerb-paperback-book&class=scaled&v=1611642036)
![Cover for Wolfgang Maderthaner · Der Kundenmanager (Paperback Book) [Softcover Reprint of the Original 1st 1987 edition] (1987)](https://imusic.b-cdn.net/images/item/original/133/9783409137133.jpg?wolfgang-maderthaner-1987-der-kundenmanager-paperback-book&class=scaled&v=1608549271)