1. AOAC (Association of Official Analytical Chemist), 1995. Official Methods of Analysis, 16th ed. Washington, DC, USA.
2. ASPA (Scientific Association of Animal Production), 1996. Metodiche per la Determinazione delle Caratteristiche Qualitative della Carne (Procedures for Meat Quality Evaluation). University of Perugia, Perugia, Italy, pp. 69–70.
3. Optimisation du jugement de la fermeté du gras de couverture des carcasses d’agneaux de bergerie (Optimization of firmness trial for fat carcass appreciation in market lambs);Bouillier-Oudot;Ann. Zootech.,1992
4. Effect of lamb growth rate and growth pattern on carcass fat levels;Chestnutt;Anim. Prod.,1994
5. CIE (Commission International d’Eclairage) 1986. Colorimetry, 2nd ed. Publication CIE 15.2, Vienna.