Averos, I. F. ., W. Widodo, C. A. . Widiyatami, and W. E. T. . Utami. “Diversity of Ferns (Pteridophyta) in Ancient Volcano Mount Nglanggeran Climbing Track and the Booklet Development for Independent Learning Sources”. Proceeding International Conference on Science and Engineering, vol. 2, Mar. 2019, pp. 101-5, doi:10.14421/icse.v2.63.