Rouchaud, J., Moons, C., & Meyer, JA. (1983). Effects of Selected Insecticides and Herbicides On the Carotene Content of Summer Carrots. Scientia Horticulturae, 19(1-2), 33-37. https://doi.org/10.1016/0304-4238(83)90041-9 (Original work published 1983)