Links and sources:
Linkovi
Izvori
- Boris Puhlovski, Penkala leti (Penkala flying, life and work of the inventor), Globus, Zagreb, 1987
- Miroslav Tischler, Penkala writing accessories, Zagreb, own edition, 2001
- Leksikon Minerva, Zagreb 1936.
- Articles and documents from the daily press, various encyclopaedias and lexicons, and from the Internet
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