R. H. Saul, A. N. Francisca, C. O. Octavio, G. M. Anastasio, O. P. Jaime, and V. A. M. Trinidad, “Chemical Composition, In vitro Digestibility of Foliage Guazuma ulmifolia and Crescentia alata and its Use in Feeding Lambs”, Pak. J. Nutr., vol. 11, no. 12, pp. 1139–1145, Nov. 2012, doi: 10.3923/pjn.2012.1139.1145.