Practical work tasks /
Pogson, Beryl,1895-
Creed, Lewis.
Gurdjieff, Georges Ivanovitch,1872-1949.
Uspenskiĭ, P. D.(Petr Demʹi︠a︡novich),1878-1947.
Nicoll, Maurice,1884-1953.
York : Quacks Books,
c1995.