Procedure for proclamation of state of emergency
Section 305(1) · 1999 Constitution (2004 edition)
What Constitution says
(1) Subject to the provisions of this Constitution, the President may by instrument published in the Official -Gazette} of the Government of the Federation issue a Proclamation of a state of emergency in the Federation or any part thereof.
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 124–125. Original document
Release: draft-c8d50d87fae9. Source scope, review and corrections