N.J. Stat. Ann. § 18A:46-24

Any two or more districts may provide for facilities, examinations or transportation under this chapter under the terms of an agreement adopted by resolutions of each of the boards of education concerned setting forth the essential information concerning the facilities, examination or transportation to be provided, the method of apportioning the cost among the districts and of computing the proportion of the state aid to which each district shall be entitled, and any other matters deemed necessary to carry out the purpose of the agreement. No such agreements shall become effective until approved by the commissioner.