Rawlynce C. Bett, Mwai A. Okeyo, Birgitta Malmfors, Kjell Johansson, Morris Agaba, Donald R. Kugonza, A.K.F.H. Bhuiyan, Anibal E. Vercesi Filho, Arthur S. Mariante, Fidalis D. Mujibi, Jan Philipsson (2013). Cattle Breeds: Extinction or Quasi-Extant?. Resources2 (3): 335–357. doi:10.3390/resources2030335.
Rawlynce C. Bett, Mwai A. Okeyo, Birgitta Malmfors, Kjell Johansson, Morris Agaba, Donald R. Kugonza, A.K.F.H. Bhuiyan, Anibal E. Vercesi Filho, Arthur S. Mariante, Fidalis D. Mujibi, Jan Philipsson (2013). Cattle Breeds: Extinction or Quasi-Extant?. Resources2 (3): 335–357. doi:10.3390/resources2030335.
researchgate.net
R.C. Bett, K. Johansson, E. Zonabend, B. Malmfors, J. Ojango, M. Okeyo, J. Philipsson (2010). Trajectories of Evolution and Extinction in the Swedish Cattle Breeds. In: 9th World Congress on Genetics Applied to Livestock Production: Proceedings; Leipzig, Germany; August 1–6, 2010. Leipzig: Gesellschaft für Tierzuchtwissenschaften. ISBN9783000316081.
web.archive.org
Swedish Cattle Breeds. North European Cattle Diversity Project. Archived ngày 18 tháng 3 năm 2009.