Grant et al., 1985. In: Heath, M. E. ; Barnes, R. F. ; Metcalfe, D. S. (Eds.). Forages, the science of grassland agriculture. 4th ed. Iowa State Press
Document reference
Grant, W. F. ; Marten, G. C., 1985. Birdsfoot trefoil. In: Heath, M. E. ; Barnes, R. F. ; Metcalfe, D. S. (Eds.). Forages, the science of grassland agriculture. 4th ed. Iowa State Press