1. A.O.A.C., 1984. Official Methods of Analysis, 14th Edition. Association of Official Analytical Chemists, Arlington, VA, USA.
2. The effects of age and reproductive status on serum and blood parameters in Merino breed sheep;Alonso;J. Vet. Med. Assoc.,1997
3. Influence of age, season, and pregnancy upon blood parameters in Austrian Karakul sheep;Baumgartner;Small Rumin. Res.,1994
4. Hajdarević, F., Lokvančić, H., Mutevelić, T., Nezirović, N., 1989. Kliničko-laboratorijsko prosuđivanje nekih biokemijskih i mineralnih parametara visoko gravidnih ovaca. (A clinical-laboratory assessment of several biochemical and mineral parameters of late pregnant ewes.) XIV Savjetovanje-Nove i sav. metode u razmnožavanju ovaca i koza. Ohrid, Macedonia, pp. 71–78 (in Croatian with English abstract).
5. Kaneko, J.J., 1997. Clinical Biochemistry of Domestic Animals, 5th Edition. Academic Press, San Diego, pp. 661, 890–894.