1. Wrathall AE. Reproductive disorders in Pigs, rev. series no. 11. Farnhem Royal, England: Commonwealth Agricultural bureau; 1975. p. 1960.
2. Hodges RT, Stocker RP, Buddle JR. Leptospira interrogans serotype Pomona infection and Leptospiruria in vaccinated pigs. N Z Vet J. 1976;24:37–9.
3. Ellis WA. In: Straw BE, Zimmerman JJ, D'Allaire S, Taylor DJ, editors. Leptospirosis, chapter 41, Diseases of Swine. 9th ed. Ames, IA: Blackwell Publishing; 2006.
4. Gresham A. Infectious reproductive disease in pigs. In Practice. 2003. p. 466–73.
5. The Merck Veterinary Manual. Leptospirosis in swine by T. J. Divers, April 2015, http://www.merckvetmanual.com/mvm/generalized_conditions/leptospirosis/leptospirosis_in_swine.html