Quote Investigator’s chronology runs: Leonard Lyons’ column of August 16, 1952 in The Post-Standard of Syracuse, quoting Hurok on his own film biography Tonight We Sing; Joseph Roddy’s LIFE profile of June 1, 1959, “Impresario Who Booked the Bolshoi,” which reprises the line; then, on September 13, 1962, a Times-Picayune report of Joe Garagiola addressing a “Banquet of Champions” for young ballplayers, passing on his friend Yogi’s quip about the sagging Kansas City attendance. A 1963 Celebrity Register entry for Hurok carries the showman’s version yet again.
Berra himself was open about it. In When You Come to a Fork in the Road, Take It!, written with David Kaplan and published by Hyperion in 2001, he wrote that he thought he first said it about the poor attendance in Kansas City, and that he said something like it again to Bud Selig during Selig’s spell as interim commissioner, when the gate was falling under the threat of a strike. He was, in other words, describing a line he had reused — not one he had coined.
The clipped question form on this page — “how are you going to stop them?” — is the version that ended up on mugs and t-shirts. It does not appear in any of the mid-century newspaper citations; the source Wikiquote gives for it is Berra’s own The Yogi Book, page 36, in the Workman edition Wikiquote dates to 1997 (Open Library catalogues the Workman printing as New York, 1998).