found: His Životopis Konštantína Čulena, 1984:t.p. (František Vnuk) p. 228 (prof.)
found: LC data base, 5-28-86(hdg.: Vnuk, František)
found: Kto je kto na Slovensku, 1991:(Vnuk, František; b. April 8, 1926; metallurgist & hist.; after 1949 in exile)
found: Wikipedie, otevřená encyklopedie, January 24, 2017:František Vnuk page (František Vnuk; born 8 April 1926 in Červený Hrádok; Slovak historian, journalist, metallurgist and college teacher; Emigrated to Austria in 1949 and lived in Australia from 1950; returned to Slovakia after the fall of Communism in Czechoslovakia, where he taught at the Římskokatolická cyrilometoděská bohoslovecká fakulta of the Univerzita Komenského v Bratislavě and was active in the Matice Slovenská; author of works in Slovak and English on Slovak history; also author of works on the history of the church in Slovakia) - https://cs.wikipedia.org/wiki/Franti%C5%A1ek_Vnuk
found: Moje poznámky k historickým dňom, 1971:title page (František Vnuk) page 5 (F. Vnuk)