- Author: Nigeria Nigeria Federal Inland Revenue Service
- Language: English
- Year: 2012
- Author: Silvio Pons (editor), Robert Service (editor)
- Language: English
- Year: 2022
- Author: Foreign Service Institute (U.S.)
- Language: English
- Year: 1961
- Author: Foreign Service Institute (editor)
- Language: English
- Year: 1965
- Author: Foreign Service Institute (U.S.), Earl W. Stevick (editor), Linda Hollander (editor)
- Language: English
- Year: 1965
- Author: Carleton Taylor Hodge, Foreign Service Institute (U.S.)
- Language: English
- Year: 1961
- Author: Foreign Service Institute, Someth Suos.
- Language: English
- Year: 1970
- Author: Carleton Taylor Hodge, Foreign Service Institute (U.S.)
- Language: English
- Year: 1961
