Gittinger, J. P. (1990). Evaluasi Proyek J. Price Gittinger. s.n.
Chicago Style (17th ed.) CitationGittinger, J. Price. Evaluasi Proyek J. Price Gittinger. s.n, 1990.
MLA引文Gittinger, J. Price. Evaluasi Proyek J. Price Gittinger. s.n, 1990.
警告：這些引文格式不一定是100％准確.