Retailing in the 21st century. Current and future trend / Ed. M. Krafft, 2010. - XV, 462 p. с. - Текст : непосредственный.
International direct marketing : principles, best practices, marketing facts / ed. M. Krafft, 2007 r=on-line
Retailing in the 21st century : current and future trends / SpringerLink (Online service), 2006 r=on-line. - Текст : электронный.
Retailing in the 21st century : crrent and future trends / SpringerLink (Online service), 2010 r=on-line. - Текст : электронный.