- Author: Humberto F. Faccini, S.P. Fernandez
- Language: Spanish, Castilian
- Year: 2009
- Author: Leonel Velásquez
- Language: Spanish, Castilian
- Year: 2011
- Author: Adolfo Bernal
- Language: Spanish, Castilian
- Year: 2008
- Author: William Francis Morella
- Language: English
- Year: 2012
- Author: Laila Qadira Yamini
- Language: English
- Year: 2012
- Author: Hugh MacDonald
- Language: English
- Year: 2008
- Author: Farm Business Association Foundation
- Language: English
- Year: 2007
- Author: Ken McLeod
- Language: English
- Year: 2008
- Author: Ella LeBain
- Language: English
- Year: 2012
- Author: Dr. Terry Simpson
- Language: English
- Year: 2004