↑Hawksworth, D.L.; Santesson, R., 1988Skyttella, a new genus for Phacopsis mulleri Willey (syn. Agyrium flavescens Rehm) In: Graphis Scripta 2(2):33–37
↑ 2.02.1Roskov Y., Kunze T., Paglinawan L., Orrell T., Nicolson D., Culham A., Bailly N., Kirk P., Bourgoin T., Baillargeon G., Hernandez F., De Wever A. (red) (2013). "Species 2000 & ITIS Catalogue of Life: 2013 Annual Checklist". Species 2000: Reading, UK. Ginkuhà 8 Septyembre 2013.CS1 maint: multiple names: authors list (link)