Autor: Michael Levine, 7 titluri

Michael Levine,Michael Levine

Dale Carnegie,Stuart R. Levine,Michael Crom

Dale Carnegie,Stuart R. Levine,Michael Crom,Dale Carnegie & Associates,Inc.

Damian Cox,Marguerite La Caze,Michael P. Levine

Joel Andriantsimbazovina,Adeline Gouttenoire,Michel Levinet,Jean Pierre Marguenaud,Frederic Sundre