1. Association of Official Agricultural Chemists, 1955. Official Methods of Analysis. 8th ed., Washington, D.C.
2. Standardization of assay for unidentified growth factors;Barnett;Poultry Sci.,1956
3. Multiple range and multiple F tests;Duncan;Biometrics,1955
4. Investigations concerning the digestibilty of protein in poultry;Ekman;Annals Royal Agr. College of Sweden,1949
5. Unidentified factor found in autoclaved litter;Elam;Poultry Sci.,1954