- Author: Richard Brown Claudia Martínez Freund Désirée Pérez Lüngen y Gipsy Geisen
- Language: Spanish
- Year: 2012
- Author: Steven M. Freund Mali Jones Joy L. Starks
- Language: English
- Year: 2013
- Author: Michele Crump and LeiLani Freund (Auth.)
- Language: English
- Year: 2012
- Author: Ramon Littell Walter Stroup Rudolf Freund
- Language: English
- Year: 2002
- Author: Richard M. Lerner Willis F. Overton Alexandra M. Freund Michael E. Lamb
- Language: English
- Year: 2010
- Author: Peter Freund
- Language: English
- Year: 2007
- Author: H. P. Freund T. M. Antonsen Jr. (auth.)
- Language: English
- Year: 1992
- Author: Dr. Michael Freund (auth.)
- Language: German
- Year: 1997