1. 1963 Method for determination of PER and NPR. In: Evaluation of Protein Quality (Publication 1100). National Academy of Sciences-National Research Council. Washington, DC, USA.
2. Codex Committee on Vegetable Protein 1989 Working Groups Report of the Fifth Session on Protein Quality Measurement. Codex Alimentarius Commission Document, Alinorm 89/30, Food and Agriculture Organization, Rome, Italy.
3. Multiple Range and Multiple F Tests
4. FAO/WHO 1989 Report of Joint FAO/WHO Expert Consultation Committee on Protein Quality Evaluation. Bethesda, USA.