'Scientists and Craftsmen in Sir Christopher Wren's London', lecture by Professor Allan Chapman, Gresham College, 23 April 2008 (available in text, audio and video formats).
Diakses tanggal 2009-09-06.  (Inggris)'Scientists and Craftsmen in Sir Christopher Wren's London', kuliah oleh Professor Allan Chapman, Gresham College, 23 April 2008 (tersedia dalam format teks, audio dan video).