อ้างอิง ของ โรงฆ่าสัตว์

  1. 1 2 Canencia, Oliva P; Dalugdug, Marlou D; Emano, Athena Marie; Mendoza, Richard; Walag, Angelo Mark P. (2016-08-31). "Slaughter waste effluents and river catchment watershed contamination in Cagayan de Oro City, Philippines". ResearchGate. 9 (2). ISSN 2220-6663.
  2. "Top 10 Animal Rights Activists". Belief Net.