Linda VanAller Hernick, Ed Landing und Kenneth E. Bartowski:Earth’s oldest liverworts – Metzgeriothallus sharonae sp. nov. from the Middle Devonian (Givetian) of eastern New York, USA. In: Review of Palaeobotany and Palynology. Band148, Nr.2–4, 2008, S.154–162, doi:10.1016/j.revpalbo.2007.09.002.
Lars Söderström et al. (2016): World checklist of hornworts and liverworts. PhytoKeys 59: 1–828. doi:10.3897/phytokeys.59.6261 (open access)