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nih.gov
pubmed.ncbi.nlm.nih.gov
Reinli, K.; Block, G. (1996). "Phytoestrogen content of foods—a compendium of literature values". Nutrition and Cancer. 26 (2): 123–148. doi:10.1080/01635589609514470. PMID8875551.
Adams, N. R. (1995). "Detection of the effects of phytoestrogens on sheep and cattle". J. Animal Sci. 73 (5): 1509–1515. doi:10.2527/1995.7351509x. PMID7665383.
Yoder, R. A.; et al. (1990). "Growth and reproductive performance of ewe lambs fed corn or soybean meal while grazing pasture". J. Animal Sci. 68 (1): 21–27. doi:10.2527/1990.68121x. PMID2303397.