Winterhalder, B., R. Larsen, and R. B. Thomas. Dung as an essential resource in a highland Peruvian community. Human Ecology. 1974.,2: 89–104.doi:10.1007/BF01558115.请检查|date=中的日期值 (帮助)
Antibiotics and Hormones in Animal Manure (Webcast): A two part webcast series about the science available on potential risks and best management practices related to antibiotics and hormones from animal manure