Autor: Robert collier, 7 titluri

Napoeon Hill,Joseph Murphy,Wallace D.wattles,Robert Collier,Erin Hunter,Daniel Mitel

Napoleon Hill,James Allen,William Walker Atkinson,Dr Joseph Murphy,Earl Nightingale,Russell H. Conwell,Theron Q. Dumont,Robert Collier,Louis M. Grafe,Orison Swett Marden,Julia Seton,Elizabeth Towne,Ralph Waldo Trine