Kouprey
Biology, ecology, habitat, and status of rare, threatened and endangered species of mammals and information on their native countries: biodiversity, ecosystems, population, and land use
http://www.animalinfo.org/species/artiperi/bos_sauv.htm
Melkunie Koeien
Artikel van ferry piekart, verschenen in het blad: kijk, deel 1.
http://www.dierencasting.nl/artikelen/koe.htm