1. Altman, D.G., 1991. Practical Statistics for Medical Research. Chapman and Hall, London, New York, Tokyo, Melbourne, Madras, p. 74–76.
2. Anonymous, 2003. Statens Jordbruksverks föreskrifter om djurhållning inom lantbruket mm. (The Swedish Board of Agriculture's regulations on the keeping of agricultural animals), SJVFS 2003:6, p. 23.
3. Effect of individual versus group rearing on ethological and physiological repsonses of crossbred calves;Babu;Appl. Anim. Behav. Sci.,2004
4. De Laval International AB, 2000. Efficient calf management. Sandströms & Söner, Tumba, Sweden.
5. Effects of confinement on rebounds of locomotor behaviour of calves and heifers, and the spatial preferences of calves;Jensen;Appl. Anim. Behav. Sci.,1999