He held the national high school record in the 500-yard freestyle for 30 years (1983-2013),[2] and held the Stanford record in the 1,650-yard freestyle for 21 years (1986–2007).[3]
^"Kostoff, Miss Richardson Win 3d Events", The New York Times. June 28, 1983. Section A, p. 24.
^"Archived copy"(PDF). Archived from the original(PDF) on September 30, 2007. Retrieved September 1, 2007.{{cite web}}: CS1 maint: archived copy as title (link)