K.Periyanayagam, et al. “EVALUATION OF PHARMACOGNOSTICAL AND PHYTOCHEMICAL PROPERTIES OF THE LEAVES OF PSIDIUM GUAJAVA LINN- LUKNOW 49 VARIETY”. Innovare Journal Health Sciences, vol. 1, no. 3, Oct. 2013, pp. 6-9, https://www.journals.innovareacademics.in/index.php/ijhs/article/view/405.