Gray, MarionA., Delahunt, Brett, Fowles, Jefferson R. , Wienstine, Philip, Cooke, Russell R., and Nacey, John N. (2004) Demographic and clinical factors as determinants of serum levels of prostate specific antigen and its derivatives. Anticancer Research, 24 (3). pp. 2069-2072.

Grey, Marion A., Delahunt, Brett, Fowles, Jefferson R., Weinstein, Philip, Cooke, Russell R., and Nacey, John N. (2003) Assessment of ethnic variation in serum levels of total, complexed and free prostate specific antigen. Comparison of Maori, Pacific Island and New Zealand European populations. Pathology, 35 (6). pp. 480-483.