(en) Volker Poelzl, CultureShock! Portugal: A Survival Guide to Customs and Etiquette, Marshall Cavendish International Asia Pte Ltd, (ISBN978-981-4435-62-8, lire en ligne), p. 153
(en) Ana Patuleia Ortins, Authentic Portuguese Cooking: More Than 185 Classic Mediterranean-Style Recipes of the Azores, Madeira and Continental Portugal, Page Street Publishing, , 289–290 p. (ISBN978-1-62414-195-9, lire en ligne)