1. 1. R. Braithwaite "The Sphagnaceae or Peat-Mosses of Europe and North America." London, 1880 ; 88 pp.
2. 2. D. H. Campbell "Mosses and Ferns." London, 1905 (2nd ed. ).
3. 3. J. Cardot "Repertoire sphagnologique ." Bull. Soc. Hist. Nat, 1897 .; 200 pp.