Hultnäs, C. A. (1959). Studies on variation in mating behavior and semen picture in young bulls of the Swedish red-and-white breed and on causes of this variation. Almqvist & Wiksells.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Hultnäs, C. A. Studies on Variation in Mating Behavior and Semen Picture in Young Bulls of the Swedish Red-and-white Breed and on Causes of This Variation. Uppsala: Almqvist & Wiksells, 1959.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Hultnäs, C. A. Studies on Variation in Mating Behavior and Semen Picture in Young Bulls of the Swedish Red-and-white Breed and on Causes of This Variation. Almqvist & Wiksells, 1959.
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