APA (7th ed.) Citation

Welsh, A. H., Carroll, R. J., & Ruppert, D. (1991). Fitting heteroscedastic regression models. Department of Statistics, Texas A & M University.

Chicago Style (17th ed.) Citation

Welsh, A. H., Raymond J. Carroll, and David Ruppert. Fitting Heteroscedastic Regression Models. College Station, Texas: Department of Statistics, Texas A & M University, 1991.

MLA (9th ed.) Citation

Welsh, A. H., et al. Fitting Heteroscedastic Regression Models. Department of Statistics, Texas A & M University, 1991.