
- Author: Isawa J. Elaigwu
- Language: English
- Year: 2008

- Author: Philomina E. Okeke
- Language: English
- Year: 2004

- Author: Nkem Emerald Osuigwe
- Language: English
- Year: 2014

- Author: Grace O. Okoye
- Language: English
- Year: 2014

- Author: Oladokun Omojola
- Language: English
- Year: 2014

- Author: Olayiwola Bello
- Language: English
- Year: 2012

- Author: Raffaello Cervigni, Irina Dvorak, John Allen Rogers
- Language: English
- Year: 2013

- Author: Kaye Whiteman
- Language: English
- Year: 2012

- Author: Frederic Will
- Language: English
- Year: 2013

- Author: Nigeria Nigeria Federal Inland Revenue Service
- Language: English
- Year: 2012