1. Official Methods of Analysis,1980
2. Coxworth, E., J. Kernan, D. Thompson, P. Kullman, W. Darrach, and D. Spurr, 1978. Processing of straw with ammonia to produce new products with increased value as animal feeds. Vol. II. Development of the ammoniation method into a commercial process. Saskatchewan Res. Counc. Rep. C 78–14.
3. Coxworth, E., and I. McGregor, 1980. Effect of ammonia treatment on the glucosinolates and related isothiocyanates of yellow or oriental mustard seeds. Saskatchewan Res. Counc. Rep. C-814-K-1-B-80.
4. The analysis of glucosinolates in Brassica species using gas chromatography;Heaney;Direct determination of the thiocyanate ion precursors, glucobrassicin and neoglucobrassicin. J. Sci. Food Agric.,1980
5. Determination of the tryptophan content of feedingstuffs with particular reference to cereals;Miller;J. Sci. Food Agric.,1967