1. Some general references: J. Wilks, Properties of Liquid and Solid Helium (Oxford Univ. Press, 1967)
2. Some general references: J. G. M. Armitage and I. E. Farquhar eds., The Helium Liquids (Academic, New York, 1975).
3. Some general references: K. H. Bennemann and J. B. Ketterson, eds., The Physics of Liquid and Solid Helium (Wiley, New York, 1976?78), vol. 2.
4. E. Feenberg, Theory of Quantum Fluids (Academic, New York, 1969).
5. D. M. Ceperley and M. H. Kalos, in Monte Carlo Methods in Statistical Physics, K. Binder, ed. (Springer, Berlin, 1979); K. E. Schmidt and M. H. Kalos, in Applications of the Monte Carlo Method in Statistical Physics, K. Binder, ed. (Springer, Berlin, 1984).