- Author: Sharon Gmelch, Pat Langan, George Gmelch
- Language: English
- Year: 1975
- Author: George Gmelch, Sharon Bohn Gmelch
- Language: English
- Year: 2018
- Author: George Gmelch
- Language: English
- Year: 2016
- Author: Sharon Bohn Gmelch, George Gmelch
- Language: English
- Year: 2014
- Author: George Gmelch
- Language: English
- Year: 2012
- Author: Prof. George Gmelch Prof. Sharon Bohn Gmelch
- Language: English
- Year: 2018
- Author: George Gmelch Walter P. Zenner
- Language: English
- Year: 2001
- Author: George Gmelch
- Language: English
- Year: 2003
- Author: George Gmelch J.J. Weiner
- Language: English
- Year: 1998