Yorkshire Heraldry Society. Aspects of heraldry. Yorkshire Heraldry Society.
Citazione stile Chigago Style (17a edizione)Yorkshire Heraldry Society. Aspects of Heraldry. Leeds: Yorkshire Heraldry Society.
Citatione MLA (8a ed.)Yorkshire Heraldry Society. Aspects of Heraldry. Yorkshire Heraldry Society.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.