- Author: Peter Winch, Michael Campbell, Sarah Tropper, David Cockburn
- Language: English
- Year: 2020
- Author: Michael Campbell Lynette Reid
- Language: English
- Year: 2020
Italian Fluency 3
epub
- Author: Michael Campbell
- Language: English
- Year: 2014
- Author: Michael Campbell
- Language: English
- Year: 2014
- Author: Michael Campbell
- Language: English
- Year: 2018
- Author: Michael Campbell Dahye Jeon
- Language: English, Korean
- Year: 2016
Korean Fluency 1
pdf
- Author: Michael Campbell Dahye Jeon
- Language: English, Korean
- Year: 2016
- Author: Michael Campbell Ksenia Ortyukova
- Language: English, Русский
- Year: 2014
- Author: Michael Campbell Ksenia Ortyukova
- Language: English, Русский
- Year: 2014
- Author: Michael Campbell Volodymyr Nesin
- Language: English, Ukranian
- Year: 2015