Earlier version published under the title: Ensaios de mitologia cristã : o Preste João e a reversibilidade simbólica by Assírio & Alvim, Lisboa, 1997.
Essays in Christian mythology : the metamorphosis of Prester John by Manuel João Ramos. ISBN 0761833889. Published by University Press of America in 2006. Publication and catalogue information, links to buy online and reader comments.