Snowden, J. P., V. Cockerell, and H. M. Bowen. "Pesticide usage in maltings 1985-86, Survey Report 67." In Pesticide usage in Scotland : grain storage premises 1982 - 86, edited by G. Hosie and J. P. Snowden, 27-33. Edinburgh: Department of Agriculture and Fisheries for Scotland, 1988.
Snowden, J. P., V. Cockerell, and H. M. Bowen. "Pesticide usage in animal and poultry feed premises 1985-86, Survey Report 66." In Pesticide usage in Scotland : grain storage premises 1982 - 86, edited by G. Hosie and J. P. Snowden, 21-26. Edinburgh: Department of Agriculture and Fisheries for Scotland, 1988.