Siregar, E.S., Ariyanti, N.S. and Tjitrosoedirdjo, S.S. 2014. The Liverwort Genus Marchantia (Marchantiaceae) of Mount Sibayak North Sumatra, Indonesia. BIOTROPIA. 20, 2 (Feb. 2014). DOI:https://doi.org/10.11598/btb.2013.20.2.327.