ISBN

ISBN (International Standard Book Number) na one special number wey dem dey give book for market, just to make sure say no oda book get di same number. But *no be every time e dey happen like dat o!* If dem dey sell book as set (like pack of books togeda), dem go use di same ISBN for all. Example, dat *Vance Integral Edition* book set wey contain 44 books, dem just use two different ISBN numbers take identify all of am. Na publishers dey buy or collect dis ISBN numbers from one branch of di International ISBN Agency.