APA način citiranja (7. izdanje)
ebrary, Inc, & Okauru, I. O. (2012). Federal inland revenue service and taxation reforms in democratic Nigeria. Safari Books.
Čikaški stil citiranja (17. izdanje)
ebrary, Inc, i Ifueko Omoigui Okauru. Federal Inland Revenue Service and Taxation Reforms in Democratic Nigeria. Ibadan, Nigeria: Safari Books, 2012.
MLA način citiranja (9. izdanje)
ebrary, Inc, i Ifueko Omoigui Okauru. Federal Inland Revenue Service and Taxation Reforms in Democratic Nigeria. Safari Books, 2012.
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