[es] el-sistema-de-la-llave-maestra Charles Haanel Obelisco
[de] Das Master Key System RaBaKa-Publishing
[de] Ein Buch ueber Dich
[en] 50 Classic Self-Help And Motivational Books You Have To Read Before You Die Oregan Publishing
Hill, Napoleon & Franklin, Benjamin & Haanel, Charles F. & Shinn, Florence Scovel & Wattles, Wallace D. & Allen, James & Tzu, Lao & Gibran, Khalil & Marden, Orison Swett & Bayley, Abner & Barnum, P.T. & Carnegie, Dale & Aurelius, Marcus & Hamblin, Henry Thomas & Murphy, Joseph & Hunter, William Crosbie & Emerson, Ralph Waldo & Brown, Henry H. & Conwell, Russell H. & Atkinson, William & Austin, B.F. & Lewis, H.A. & Rogers, L.W. & Fairbanks, Douglas & Tzu, Sun & Smiles, Samuel