Okoli, I., Alaehie, D., Akanno, E., Okoli, C., Opara, M., Uchegbu, M., Ogundu, U., & Iheukwumer, F. (2004). Concentrations of Aerial Pollutant Gases in Selected Poultry Pens in Imo State, Nigeria. International Journal of Poultry Science, 3(6), 427–431. https://doi.org/10.3923/ijps.2004.427.431