D. S.  Carson, Tribble, P. W., and Weart, C. W., ?Pyrethrins combined with piperonyl butoxide (RID) vs 1% permethrin (NIX) in the treatment of head lice?, American Journal of Diseases of Children, vol. 142, no. 7, pp. 768 - 769, 1988.

N. K.  Pitman, Hernandez, A., and Hernandez, E., ?Comparison of pediculicidal and ovicidal effects of two pyrethrin-piperonyl-butoxide agents?, Clinical therapeutics, vol. 9, no. 4, pp. 368 - 372, 1987.

D. M.  Elston, ?What's eating you? Pediculus humanus (head louse and body louse)?, Cutis, vol. 63, no. 5, pp. 259 - 264, 1999.