Constitution can be derived from various sources, namely:
1. History Of The People: The past, present and future lives of the people are always taken into consideration in the formulation of a constitution.
2. Acts Of Parliament: The laws or enactment by the parliaments always form part of constitutional framing.
3. Customs And Traditions: Customs of the people which include beliefs, institutions, norms and values for whom the constitution is meant are always important in the formation of a constitution.
4. Past Constitution: Past constitution and constitutions of other countries most often forms the basis of any new constitution, provided a model for the 1917 constitution of Nigeria.
5. Conventions: Very often, matters decided in conventions always form a part of the instruments of a country’s constitution. Such rules, percepts that guides people’s behaviour are important.
6. Decisions Of Constitutional Conference: These are meetings at which difficult constitutional issues are discussed and resolved in preparation for a new constitution. Decisions of such conferences often form the basis for a new constitution.
7. Intellectual Works: Intellectual works such as those of Marx, John Locke, Hobbes, A.Y Dicey etc are useful mascims (accepting rules) for constitutional framing.
8. International Laws like AU, UNO, Aviation Laws, ILO etc, serve as source of a constitution.
9. Judicial Precedents: These are past judgement at law courts on constitutional matters and they often form the basis for a new constitution.
10. Decrees: Promulgation (making an official announcement) by unitary government in many countries serves as source of constitution.