Piotr Jaworski, PioM; 19 V 2005r., POLAND/Poznań; Polski: Herb Zakonu Cystersów English: order of cisters coat of arms Español: Escudo heráldico cisterciense
Herculano. 1867 (O Monasticon em duas partes: Eurico o presbytero e O monge de Cistér) Language Portuguese Publication date 1877; 1867 Place of publication Leipzig