* Clayton, H.M., Trawford, A.F. (1981). ‘Anthelmintic control of lungworms in donkeys’. ''Equine Veterinary Journal'' 13(3). pp 192-194. | * Clayton, H.M., Trawford, A.F. (1981). ‘Anthelmintic control of lungworms in donkeys’. ''Equine Veterinary Journal'' 13(3). pp 192-194. |