Wren Society [Hrsg.]; Wren, Christopher [Bearb.]: The ... volume of the Wren Society (Band 14): Engravings of St. Paul's Cathedral and part II of the building accounts for the years 1685 - 95 (Oxford, 1937)

PLATE IX

PERSPECTIVE SECTION, EARLY DESIGN FOR DOME.
SEE WREN SOC., VOL. III, PL. XIX.