N.J. Stat. § 19:23-22.4
In all counties the county clerk shall cause to be printed a sufficient number of official primary ballots and official primary sample ballots of each political party, in proper form for the mailing of such sample ballots at the times and in the manner and number as required by the provisions of Title 19 of the Revised Statutes, and shall furnish such official primary sample ballots to the proper officer or officers on the earliest possible date preceding the primary election.
In the counties described by this section, for each election district within the county in which the primary language of 10% or more of the registered voters is Spanish, the county clerk shall similarly cause to be printed bilingually in English and Spanish a sufficient number of official primary sample ballots of each political party, and shall similarly furnish such official primary sample ballots to the proper officer or officers.
N.J.S. § 19:23-22.4