Citazione Stile APA (7a Edizione)
Nigeria. Federal Inland Revenue Service, ebrary, Inc, & Okauru, I. O. (2012). FIRS handbook on reforms in the tax system (2004-2011). Safari Books.
Citazione stile Chigago Style (17a edizione)
Nigeria. Federal Inland Revenue Service, Inc ebrary, e Ifueko Omoigui Okauru. FIRS Handbook on Reforms in the Tax System (2004-2011). Ibadan, Nigeria: Safari Books, 2012.
Citatione MLA (9a ed.)
Nigeria. Federal Inland Revenue Service, et al. FIRS Handbook on Reforms in the Tax System (2004-2011). Safari Books, 2012.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.