국립동물검역소
경남농촌진흥원
농림기술관리센터
농림부(MAF)
농수산물 유통공사
생물학연구 정보센터
농민신문
국회입법정보서비스
Holstein Association USA Inc
Holstein Association of Canada
Ontario Holstein Association
Red & White Dairy Cattle Assoc.
Wisconsin Holstein Association
National Dairy Shrine
State University of New York - Cobleskill
Penn State's Dairy Cattle Nutrition Site
University of Vermont - CREAM