Yuliasmara, Fitria, and Fitria Ardyani. 2013. “Morphology, Physiology, and Anatomy of Penny Fern (Drymoglossum Phyloselloides)and Its Effect on Cocoa”. Pelita Perkebunan (a Coffee and Cocoa Research Journal) 29 (2). https://doi.org/10.22302/iccri.jur.pelitaperkebunan.v29i2.60.