N. D. POLARA, et al. “EFFECT OF NITROGEN AND PHOSPHORUS ON NUTRIENT CONTENT AND UPTAKE IN DIFFERENT VARIETIES OF AFRICAN MARIGOLD (TAGETES ERECTA L.)”. The Bioscan, vol. 9, no. 1, Jan. 2014, pp. 115-20, https://thebioscan.com/index.php/pub/article/view/604.