Primary references

• Beketow, A.N. 1862–1874. Курсъ ботаники [Course of Botany]. St.-Petersburg: v tipografii V. Bezobrazova i Kompanii, 1: 1–44 [27 Dec 1862 (14 Dec 1862, Old Style)], 45–94, xi–xvii [14 (2, Old Style) Mai 1863], 94–138 [2 Jan 1864 (21 Dec 1863, Old Style ‘1863’)], 139–218, xii–xvii, xxvii–xxxiii [11 Mai (30 Apr 1864, Old Style) 1864], 219–318, xvi, xxxiii–lix [1 Feb (21 Jan, Old Style) 1865 ‘1864’]; 2: 1–152, i–vii [22 (10, Old Style) Sept 1871], 153–357, viii–xxxiv [8 Mai (26 Apr, Old Style) 1874] Google Books (Volume 1) Google Books (Volume 2, Part 1) Google Books (Volume 2, Part 2) Reference page. 

Additional references

• Doweld, A.B. 2001. Prosyllabus Tracheophytorum. Tentamen systematis plantarum vascularium (Tracheophyta) [Prosyllabus Tracheophytorum. Опыт системы сосудистых растений]. LXXX + 110 pp. Moscow: Geos. ISBN 5-89118-283-1. DJVU Reference page. 

• Reveal, J.L. 2010. A checklist of familial and suprafamilial names for extant vascular plants. Phytotaxa 6: 1–402. DOI: 10.11646/phytotaxa.6.1.1 Reference page.