G.B. Shaw, Preface to the catalogue of an exhibition of sculpture by Troubetzkoy at the P. & D. Colnaghi Galleries, London, 1931, in The Complete Prefaces: 1930-1950 (Allen Lane, 1997), pp. 97-98.
From an interview. Reported in The Vegetarian Magazine, Volume 11, Issue 2, 1907, p. 22. Also quoted in Gail Davis, Vegetarian Food for Thought, pp. 69, NewSage Press, 1999.
encspb.ru
The night view of the equestrian monument to Tsar Alexander III: see here