1. ; In Handbook of Legumes of World Economic Importance (Ed.) Plenum Press, New York and London, 1981, pp. 58–59.
2. ; ; Produção e Difusao de Uso de Feno de Leguminosas Relatorio Tecnico Semestral do Departamento de Zootecnia do Centro de Ciencias Agrarias de Universidade Federal do Ceará (Brasil). Fortaleza. 1980.
3. AOAC. Official Methods of Analysis Association of Official Analytical Chemists, Washington, DC, 1970, 11th edn.
4. ; Forage Fiber Analyses (Apparatus, Reagents, Procedures and Some Applications), Agriculture Handbook No. 379. Agricultural Research Service. US Department of Agriculture. 1970.