Languages (National Assembly)
Section 55 · 1999 Constitution (2004 edition)
What Constitution says
The business of the National Assembly shall be conducted in English, and in Hausa, Ibo and Yoruba when adequate arrangements have been made therefor.
This is the 1999 Constitution as published in 2004. Later amendments aren't included yet, so a section may have changed since.
Original source
Official Gazette · CFRN 1999 official PDF · printed page 45. Original document
Release: draft-c8d50d87fae9. Source scope, review and corrections