Turin (Italy), Communal Stadium, June 14, 1957. From left to right: the first training session together for the two new signings of Juventus F.C. for the 1957–58 season, John Charles and Omar Sívori, with teammate and captain Giampiero Boniperti.
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Vittorio Martone, Enrica Speroni, Francesco Frisari (<span class="mw-formatted-date" title="2021-06-22">June 22, 2021</span>). <a rel="nofollow" class="external text" href="https://www.ultimouomo.com/giampiero-boniperti-ricordi-colori-intervista/">Giampiero Boniperti, i ricordi sono a colori</a> <span style="font-size: 0.95em; font-weight: bold; color:#555; position: relative;">(in Italian)</span>. <i>ultimouomo.com</i>.