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.
Breed data sheet: Herrgard/Sweden. Domestic Animal Diversity Information System of the Food and Agriculture Organization of the United Nations. Truy cập November 2016.
Breed data sheet: Skane/Sweden. Domestic Animal Diversity Information System of the Food and Agriculture Organization of the United Nations. Truy cập November 2016.
Breed data sheet: Smaland/Sweden. Domestic Animal Diversity Information System of the Food and Agriculture Organization of the United Nations. Truy cập November 2016.
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.