^"Turnier - Sieger" [Tournament - Winners]. Generali Open (in German). Retrieved 14 March 2022. Einzel - 1990: Horacio de la Pena (ARG)
^"Kitzbuhel: el torneo de los argentinos" [Kitzbühel: the tournament for argentinians]. ESPN (Latin America) (in Spanish). 7 September 2020. Retrieved 14 March 2022. Seven years after Vilas' final win, Horacio de la Peña became the second argentinian who obtained the title. At the 1990 final, defeated czech Karel Novacek by 6-4, 7-6, 2-6 and 6-2.
^John Barrett, ed. (1990). The International Tennis Federation : World of Tennis 1990. London: Willow Books. pp. 115, 134. ISBN9780002183550.