
- Author: National Research Council, Board on Agriculture, Subcommittee on Environmental Stress
- Language: English
- Year: 1981

- Author: Institute of Medicine, Food and Nutrition Board
- Language: English
- Year: 1989

- Author: National Research Council, Board on Agriculture, Committee on Animal Nutrition, Subcommittee on Feed Intake
- Language: English
- Year: 1987

- Author: James Johnson
- Language: English
- Year: 2006