^Al Silverman, quoted by Neyer and James, p. 293. According to Cuban baseball expert Peter C. Bjarkman, Marrero "insists that his main pitch was the slider and that he threw it exclusively at times. See Rob Neyer. "All the Pitchers Who Wouldn't Fit". مؤرشف من الأصل في 2012-02-06. اطلع عليه بتاريخ 2007-03-16.
^Like many baseball players of his era, Marrero reported several birth dates. When asked his birthdate in an interview with روبرتو غونزاليس إيشفاريا, he first hesitated, then reported it as April 25, 1911—see González Echevarría pp. 234, 417.
^González Echevarría, pp. 220, 234; Neyer and James, p. 294.
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