1. Sweatman, G. K., in Parasitic Diseases of Wild Animals (edit. by Davis, J. W., and Anderson, R. C.), 3–64 (Iowa State University Press, Ames, 1971).
2. Baker, E. W., and Wharton, G. W., An Introduction to Acarology, 465 (Macmillan, New York, 1952).
3. Radovsky, F., Acarologia, 11, 450–83 (1969).
4. Moss, W., and Camin, J., Science, 168, 1000–3 (1970).
5. Lindquist, E., Proc. second Int. Cong. Acarol., Sutton Bonington,, 1967, 389–99.