Santiago-Santos, L.R. and Cedeño-Maldonado, A. 1991. Effect of light intensities on the flowering and growth of spiny coriander (Eryngium foetidum L.). The Journal of Agriculture of the University of Puerto Rico. 75, 4 (Oct. 1991), 383–389. DOI:https://doi.org/10.46429/jaupr.v75i4.3624.