↑Bogdanov, Vladimir; Woodstra, Chris; Erlewine, Stephen Thomas (2002) All Music Guide to Jazz. p. 704. Backbeat Books. ISBN978-0-87930-717-2.
Since I was not able to view the back of the photo for possible copyright marks and dating, I did a search for original registrations in artwork basing it on the years from the beginning of the trio to when Chambers died and the group disbanded. While I believe the photo dates from before 1963, based on the zone number in Shaw Artists' New York address rather than a zip code, the years 1957, 1958, 1959, 1960, 1961, 1962, 1963, 1964, 1965, 1966, 1967. 1968 and 1969 were checked. There were no listings for anything pertaining to Wynton Kelly in the artwork category for this time period--there's no evidence of original registration for the photo.
Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (50 p.m.a.), Mainland China (50 p.m.a., not Hong Kong or Macao), Germany (70 p.m.a.), Mexico (100 p.m.a.), Switzerland (70 p.m.a.), and other countries with individual treaties.