S. S. Reaño, C. C. De Guzman, M. L. S. Edaño, and E. P. Pacardo, “Morphology and Growth of Tawa-tawa (Euphorbia hirta L.) Under Varying Levels of Shade and Nitrogen Source”, Thai. Nat. Hist. Mus. J., vol. 14, no. 1, pp. 15–29, Jun. 2020.