Sports and Sports-Related Statistics
BBallSports.com online interactive databases of historical sports statistics.
Concussion in Sports a collection of reports and statistics from the CDC.
Sports and Exercise statistics from the American Time Use Survey of the U.S. Census
Sports Organizations: Statistics
Official statistics from the sports organizations:
Major League Baseball Stats sortable by player (hitting, pitching, fielding) and by team.
National Basketball Association
National Collegiate Athletic Association College Sports Statistics and Records
Statistics in Sports: a Section of the American Statistical Association, links to several sports data sources.
Specialized Citation Guides
Society for American Baseball Research SABR Style Guide