SHOWERS, William J.; WILLIAMS, C.M.; JENNINGS, Gregory D. Impact of Large Poultry Operations on Groundwater : Stable 15N Isotopes of Nitrate Assessment. International Journal of Poultry Science, Pakistan, v. 5, n. 4, p. 318–329, 2006. DOI: 10.3923/ijps.2006.318.329. Disponível em: https://ijpsjournal.org/index.php/ijps/article/view/530. Acesso em: 21 sep. 2025.