References
- Harvey, W.R. (1960) United States Department of Agriculture, ARS-20–8, 157 pp
- Working Group 3 (1981) World's Poultry Science Journal 37: 218–221.
- Working Group 3 (1984) World's Poultry Science Journal 40: 86–87.
- Working Group 3 (1986) World's Poultry Science Journal 42: 276–284.
- Working Group 3 (1989) World's Poultry Science Journal 45: 189–192.
- Working Group 3 (1992) World's Poultry Science Journal 48: 269–270.
- Working Group 3 (1994) World's Poultry Science Journal 50: 187–189.
- Working Group 3 (1996) World's Poultry Science Journal 52: 81–83.
- Working Group 3 (1997) World's Poultry Science Journal 53: 291–296.