- Author: Betts Gregory, Bök Christian, Kaṇada
- Language: English
- Year: 2019
- Author: Betts Gregory, Brooker Bertram
- Language: English
- Year: 2012
- Author: Betts George Herbert
- Language: English
- Year: 1908
- Author: Betts Gregory
- Language: English
- Year: 2010
- Author: Betts Amanda, Kaṇada, McCrae John
- Language: English
- Year: 2015
- Author: Betts Gavin, Henry Alan
- Language: English
- Year: 2012
- Author: Betts Richard K
- Language: English
- Year: 2007
- Author: Betts Alexander
- Language: English
- Year: 2011
- Author: Betts Alexander, Collier Paul
- Language: English
- Year: 2017
- Author: Betts Alexander, Collier Paul, Dierlamm Helmut, Juraschitz Norbert
- Language: German
- Year: 2017