N. P. H.  Graham and Scott, M. T., ?Observations on the control of some ectoparasites of sheep. Part I. The use of arsenic, rotenone, sulphur and phenol compounds for the control of the sheep ked (Melophagus ovinus) and the sheep body louse (Damalinia ovis)?, Journal of the Council on Scientific and Industrial Research, vol. 21, p. 252, 1949.

N. P. H.  Graham and Scott, M. T., ?Observations on the control of some ectoparasites of sheep. Part II. Progress report on the use of DDT and hexachloride for the control of the sheep ked (Melophagus ovinus) and the sheep body louse (Damalinia ovis)?, Journal of the Council on Scientific and Industrial Research, vol. 21, p. 266, 1949.