McKean, J. W., Hettmansperger, T. P., & Sheather, S. J. (1991). The use and interpretation of residuals based on robust estimation. University of New South Wales, Australian Graduate School of Management.

McKean, Joseph W., Thomas P. Hettmansperger, and Simon J. Sheather. The Use and Interpretation of Residuals Based on Robust Estimation. Kensington, N.S.W.: University of New South Wales, Australian Graduate School of Management, 1991.

McKean, Joseph W., et al. The Use and Interpretation of Residuals Based on Robust Estimation. University of New South Wales, Australian Graduate School of Management, 1991.