found: Ze správ a kronik doby husitské, 1981 (a.e.)colophon (doc. dr. Ivan Hlaváček)
found: LC data base, 6-30-83(hdg.: Hlaváček, Ivan)
found: Historia docet, 1992:t.p. (prof. PhDr. Ivana Hlaváčka, CSc)
found: Kommunikationspraxis und Korrespondenzwesen im Mittelalter und in der Renaissance, c1998:t.p. (Ivan Hlavác̆ek) p. 234 (b. 1932)
found: Heading on resource record 99-512014(Hlaváček, Ivan, 1931-)
found: Wikipedie, otevřená encyklopedie, December 14, 2015:Ivan Hlaváček page (Prof. PhDr. Ivan Hlaváček CSc.; born 28 May 1931 in Prague; Czech historian and archivist; works in the Department of Auxiliary Sciences of History and Archival Studies at the Filozofická fakulta Univerzity Karlovy v Praze, of which he was director from 1990 to 2000; research specialization: Medieval diplomatics, codicology, and epigraphy) - https://cs.wikipedia.org/wiki/Ivan_Hlav%C3%A1%C4%8Dek