Yorkshire Heraldry Society. Aspects of heraldry. Yorkshire Heraldry Society.
Cita Chicago (17th ed.)Yorkshire Heraldry Society. Aspects of Heraldry. Leeds: Yorkshire Heraldry Society.
Cita MLA (8th ed.)Yorkshire Heraldry Society. Aspects of Heraldry. Yorkshire Heraldry Society.
Atenció: Aquestes cites poden no estar 100% correctes.