Josip Šarčević (3 October 2007). "David Frankfurter". Hrvatski Povijesni Portal (in Croatian). Miljenko Hajdarović. ISSN1846-4432. Archived from the original on 25 February 2013. Retrieved 5 February 2013.
web.archive.org
Josip Šarčević (3 October 2007). "David Frankfurter". Hrvatski Povijesni Portal (in Croatian). Miljenko Hajdarović. ISSN1846-4432. Archived from the original on 25 February 2013. Retrieved 5 February 2013.
worldcat.org
Josip Šarčević (3 October 2007). "David Frankfurter". Hrvatski Povijesni Portal (in Croatian). Miljenko Hajdarović. ISSN1846-4432. Archived from the original on 25 February 2013. Retrieved 5 February 2013.