N.J. Stat. Ann. § 40:50-15

If the question of making the purchase provided for by the contract to be abrogated had been submitted to the voters of the municipality for approval or ratification then, and in that event, the ordinance providing for the abrogation of said contract shall not be effective unless and until such abrogation has been authorized by the legal voters of the municipality at a special or general election in said municipality held in accordance with the procedure provided for in sections 40:62-3 to 40:62-5 of the Revised Statutes.