Nicola Twilley (10 June 2015). "How Does Swiss Cheese Get Its Holes?". The New Yorker. Retrieved 10 June 2015. Switzerland's cheese-blindness epidemic seems to have been caused by excessively clean milk.
Dairy Products 2020 Summary(PDF). United States Department of Agriculture, National Agricultural Statistics Service. April 2021. p. 37. Retrieved 19 March 2023.