Civil Flag of Banovina of Croatia
Ehrlich Zdvořák, Janko (2001-08-29) Croatian Bannate in Yugoslavia (1939-1941),  Flags of the World website – flagspot.net,  Last modified: 2004-10-23, Retrieved: 2010-01-25
Luchtenberg, Mello. Flag history : Croatia in Yugoslavia periods : 1939-1941,  Vexilla-mundi.com, Leeuwarden (Frisia, NL), Retrieved: 2010-01-25
Ehrlich Zdvořák, Janko. Bannate of Croatia (1939 – 1941),  miyeonjan.tripod.com, Zagreb, Last modified: 2002-05-10, Retrieved: 2010-01-25
Luchtenberg, Mello. Croatia : Color recommendations,  Vexilla-mundi.com, Leeuwarden (Frisia, NL), Retrieved: 2010-01-25
Bugoslav modified the version with the CoA (uploaded by Ex13), and also used a sourced color schemes.