Education Code § 18171

No warrant shall be drawn by the superintendent of schools upon the order of any governing board of any school district against the library fund of any district unless the order is accompanied by an itemized bill, showing the books and apparatus, and the price of each in payment of which the order is drawn, and unless the books and apparatus, except in the case of library books and apparatus purchased by a district employing a district superintendent of schools or a school librarian for full time, have been adopted by the county, city, or city and county board of education.