Dippy, J. F. J.; Hughes, S. R. C.; Rozanski, A. (1959). “The dissociation constants of some symmetrically disubstituted succinic acids”. Journal of the Chemical Society. 1959: 2492–2498. doi:10.1039/JR9590002492.
Wightman, F.; Lighty, D. L. (1982). “Identification of phenylacetic acid as a natural auxin in the shoots of higher plants”. Physiologia Plantarum. 55 (1): 17–24. doi:10.1111/j.1399-3054.1982.tb00278.x.
