Nutt, Bradley J.; Harrison, Robert J.; McComb, Jen A.; Howieson, John G. (2021). "The breeding system of Ornithopus sativus Brot. subsp. sativus". Grass and Forage Science. 76 (1): 3–9. Bibcode:2021GForS..76....3N. doi:10.1111/gfs.12521.
Nutt, Bradley J.; Harrison, Robert J.; McComb, Jen A.; Howieson, John G. (2021). "The breeding system of Ornithopus sativus Brot. subsp. sativus". Grass and Forage Science. 76 (1): 3–9. Bibcode:2021GForS..76....3N. doi:10.1111/gfs.12521.
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"Ornithopus L."Plants of the World Online. Board of Trustees of the Royal Botanic Gardens, Kew. Retrieved 28 July 2021.