šumar: 10715
1Biljak, R., F. Grospić, 2010: Ivan Oštrić, dipl. ing. – najstariji član HŠD – Ogranak Zagreb. Š.L. 11-12, s.649    PDF
2Roman Biljak, Frane Grospić, 2012: Ivan Oštrić (1915–2012). Š.L. 9-10, s.550    PDF


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