Fergusson's History of Architecture; Durand's Parallels; Eastlake's
Gothic and Revival; Ruskin, Daly, and Penrose; Britton's Cathedrals
and Architectural Antiquities; Pugin's Specimens and Examples of
Gothic Architecture; Rickman's Styles of Gothic Architecture;
Street's Gothic Architecture in Spain; Encyclopaedia Britannica
(article Architecture).