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Gratz, Norman G ,  World Health Organization. Division of Control of Tropical Diseases. WHO Pesticide Evaluation Scheme ,  [Human lice : their prevalence, control and resistance to insecticides : a review 1985-1997 / by Norman G. Gratz]

Gratz, Norman G ,  Steffen, Robert ,  Cocksedge, William S ,  [Why aircraft disinsection? / Norman G. Gratz, Robert Steffen and William Cocksedge, Désinsectisation des aéronefs : résuméDesinsectación de aviones : resumen]

Gratz, Norman G ,  World Health Organization. Division of Control of Tropical Diseases. WHO Pesticide Evaluation Scheme ,  [Human lice : their prevalence, control and resistance to insecticides : a review 1985-1997 / by Norman G. Gratz]

Gratz, Norman G ,  Steffen, Robert ,  Cocksedge, William S ,  [Why aircraft disinsection? / Norman G. Gratz, Robert Steffen and William Cocksedge, Désinsectisation des aéronefs : résuméDesinsectación de aviones : resumen]