1. Contact eczema in agricultural workers.
2. N. Hjorth, S. Fregert, A.J. Rook, D.S. Wilkinson, and F.J.G. Etiling(1968 ) In: Textbook of Dermatology (), 1st edn , vol. 1 , p.313 . Blackwell Scientific Publications, Oxford.
3. The use of antibiotics as feed additives for farm animals
4. Contact dermatitis from animal feed additives