"The Autograph Manuscript of Gervase of Tilbury", James R. Caldwell, "Scriptorium" 11 (1957); "Manuscripts of Gervase of Tilbury's Otia Imperialia", James R. Caldwell, "Scriptorium" 16 (1962); The Interrelationship of the Manuscripts of Gervase of Tilbury's Otia Imperialia", James R. Caldwell, "Scriptorium" 16 (1962) : [recenzja]