C. Beckingham: The achievements of Prester John.

C. Beckingham: Boyle memorial lecture: The quest for Prester John.
Bull. John Rylands Univ. Library 62 (1980), 299-300.

F. Cross (ed.): Oxford dictionary of the Christian Church.
Oxford UP 1983.

Bar-Ilan Meir: Prester John. Fiction and history.
The History of European Ideas 20 (1995), 291-298.

Arthur Newton: Travel in the Middle Ages.

Gustav Oppert (ed.): Der Presbyter Johannes in Sage und Geschichte.
Berlin 1870.

7802 Presbyter Johannes: Epistula. In Oppert 1870, 168-179.

Jacqueline Pirenne: La legende du Pretre Jean. Strasbourg 1991.

Vsevolod Slesarev: Prester John. The letter and the legend.