APA (7e ed.) Bronvermelding

Nigeria. Federal Inland Revenue Service, ebrary, Inc, & Okauru, I. O. (2012). FIRS handbook on reforms in the tax system (2004-2011). Safari Books.

Chicago (17e ed.) Bronvermelding

Nigeria. Federal Inland Revenue Service, Inc ebrary, en Ifueko Omoigui Okauru. FIRS Handbook on Reforms in the Tax System (2004-2011). Ibadan, Nigeria: Safari Books, 2012.

MLA (9e ed.) Bronvermelding

Nigeria. Federal Inland Revenue Service, et al. FIRS Handbook on Reforms in the Tax System (2004-2011). Safari Books, 2012.