Moscow Mathematical Society。 愛丁堡數學學會 歐洲數學學會 Susan Margaret Oakes, Alan Robson Pears, and Adrian Clifford Rice, The Book of Presidents 1865 -- 1965, London
Dearborn publishers, 1999 (页面存档备份,存于互联网档案馆) ISBN 978-1-884964-33-6 Edwin Pears, The destruction of the Greek Empire and the story of the capture of Constantinople