1. Yearbook of Farm Statistics 2009;Anonymous,2009
2. Finnish Trotting and Breeding Association, 2009. Education Material. http://www.suomenhevonen.info/hippos/suomen_hippos/dokumentit/Kalvosarja_2009.pdf (in Finnish).
3. Endoparasite control management on horse farms – lessons from worm prevalence and questionnaire data;Fritzen;Equine Vet. J.,2009
4. The changing world of worms: the rise of the cyathostomes and the decline of Strongylus vulgaris;Herd;Comp. Cont. Educ. Pract. Vet.,1990
5. Anthelmintic resistance and use of anthelmintics in horses;Coles;Vet. Rec.,2003