Hall et al., 1993. Penn State Extension. Agronomy Facts 20 Document reference Hall, M. ; Cherney, J. H., 1993. Birdsfoot trefoil. Penn State Extension. Agronomy Facts 20Web http://pubs.cas.psu.edu/freepubs/pdfs/uc087.pdfCitation key Hall et al., 1993Datasheets Birdsfoot trefoil (Lotus corniculatus)
