Analysis of information sources in references of the Wikipedia article "Сибенхар, Виллем" in Russian language version.
Naomi Segal, Edward Duyker, 'Siebenhaar, Willem (1863—1936)', Australian Dictionary of Biography, Online Edition, Copyright 2006, updated continuously, ISSN 1833-7538, published by Australian National University
Naomi Segal, Edward Duyker, 'Siebenhaar, Willem (1863—1936)', Australian Dictionary of Biography, Online Edition, Copyright 2006, updated continuously, ISSN 1833-7538, published by Australian National University