Παραπομπή σε μορφή APA (7η εκδ.)

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

Παραπομπή σε μορφή Chicago (17η εκδ.)

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

Παραπομπή σε μορφή MLA (9th εκδ.)

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