Al Ries(4) Jack Trout(3) Laura Ries(2) Petre Datculescu(2) Jim Aitchison(2) Seth Godin(2) Philip Kotler(2) Paco Underhill(1) Laura Klepacki(1) Herschell Gordon Lewis(1) Iulian Ursache(1) Jill Konrath(1) Steve Rivkin(1) Marti Barletta(1) Sun Tzu(1) Denny Hatch(1) David A. Aaker(1) Guy Kawasaki(1) Michael Newman(1) Leonard Saffir(1) Thomas Nagler(1) Jeffrey Gitomer(1) Luke Sullivan(1) David Aakerq(1) Don E. Schultz(1) Jon Steel(1)