Warren Buffett / Robert Heller ; penerjemah Irzam Hardiansyah ; editor Theresia Vini, Ratri Medya,Yati Sumiharti Heller, Robert Hardiansyah, Irzam Vini s, Theresia Medya, Ratri Sumiharti, Yati text Jakarta Esensi 2008 ind hlm 109 Warren Buffett URN:ISBN:978-979-033-254-6