The session law for L. 1981, c. 512 is available online only from the Rutgers University School of Law Camden website. It is available as part of a scanned collection of images from the original printed books. The link below will take you to the first page of the New Jersey Legislature session volume 199_2 that contains the law. From there, use the available navigation tools to get to the appropriate chapter.
CLICK HERE FOR THE SESSION LAWS
Legislative history for L. 1981, c. 512 is available from the New Jersey State Library here