"37-year-old Olympian explains how she stays so dominant at an age when most athletes retire". Interview with Emmett Knowlton, www.businessinsider.com. March 1, 2016.
Aldo Leopold (2013). “Aldo Leopold: A Sand County Almanac & Other Writings on Conservation and Ecology: (Library of America #238)”, p.557, Library of America
"37-year-old Olympian explains how she stays so dominant at an age when most athletes retire". Interview with Emmett Knowlton, www.businessinsider.com. March 1, 2016.