Willey, Thomas, and Douglas Robideaux. “The National Golf Foundation Top 100 Businesses in Golf: Investigating the Portfolio Returns Vs the Market Portfolio”. Archives of Business Research 9, no. 4 (April 23, 2021): 96–100. Accessed November 21, 2024. https://journals.scholarpublishing.org/index.php/ABR/article/view/10039.