Heart of Darkness (1899) and Nostromo(1904)

- ISBN: 978-613-8-42469-7

- ISBN: 978-620-2-27004-5

Their biological sources, properties, uses and potential applications

- ISBN: 978-3-8417-7599-3

- ISBN: 978-620-2-27291-9

- ISBN: 978-613-8-43236-4

Rhetorical Analysis of Moroccan Lawyers' Pleadings

- ISBN: 978-613-8-46175-3

- ISBN: 978-613-8-40882-6

- ISBN: 978-620-2-28565-0

Yaoundé, April 2017

- ISBN: 978-3-330-87422-0

- ISBN: 978-3-8416-1607-4