Paudel, V. R., and V.N. P. Gupta. “Effect of Some Essential Oils on Seed Germination and Seedling Length of <i>Parthenium hysterophorous< I> L”. Ecoprint: An International Journal of Ecology, vol. 15, June 2009, pp. 69-73, doi:10.3126/eco.v15i0.1945.