McMillan, Garnett, and Timothy Hanson. “SAS Macro BDM for Fitting the Dale Regression Model to Bivariate Ordinal Response Data”. Journal of Statistical Software 14, no. 2 (May 1, 2005): 1–12. Accessed April 30, 2024. https://www.jstatsoft.org/index.php/jss/article/view/v014i02.