- Author: Brinja Maria Bauer, Ralph Brucker, Britta Kunz, Michael Pietsch, Dirk Schmid, Patrick Weiland, Günter Meckenstock
- Language: German
- Year: 2018
- Author: Ralph Raico, Jorg Guido Hülsmann, Gabriele Bartel, Pia Weiß, Christian Watrin
- Language: German
- Year: 1999
- Author: Brinja Bauer (editor), Ralph Brucker (editor), Michael Pietsch (editor), Dirk Schmid (editor), Patrick Weiland (editor)
- Language: German
- Year: 2016
- Author: Ralph-Johannes Lilie
- Language: German
- Year: 2003
- Author: Sandstedt Lynn, Kite Ralph
- Language: Spanish
- Author: Dale Carnegie, Benjamin Franklin, Charles F. Haanel, Florence Scovel Shinn, Wallace D. Wattles, James Allen, Lao Tzu, Khalil Gibran, Orison Swett Marden, Abner Bayley, P.T. Barnum, Marcus Aurelius, Henry Thomas Hamblin, Joseph Murphy, William Crosbie Hunter, Ralph Waldo Emerson, Henry H. Brown, Russell H. Conwell, William Atkison, B.F. Austin, H.A. Lewis, L.W. Rogers, Douglas Fairbanks, Sun Tzu, Samuel Smiles
- Language: English
- Year: 2020
- Author: Hartmann Ralph
- Language: German
- Year: 2010
Matter
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- Author: Ralph E. Lapp
- Language: English
- Year: 1963