How many NBA championships have the Boston Celtics won?
Season Review: 1961-62
March 1 1961 NBA Program St. Louis Hawks at Boston Celtics
Bill Russell, legendary Celtics center and NBA coach, dies - Los Angeles Times
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Boston Celtics great Bill Russell, 11-time NBA champion, dies at 88 - ESPN
With the Celtics going for No. 18, here's a look back at their first 17 championships - The Boston Globe
It's About TV: This week in TV Guide: April 1, 1961
16 NBA championship contenders who weren't good enough
Bill Russell: NBA community mourns death of Celtics great, Trending
Celtics history: Boston beats St. Louis Hawks for 1961 championship
Sixty Years Later, Wilt's 100 Stands Unchallenged
The Book of Basketball: The NBA According by Simmons, Bill