Acta
Acta Botanica Fennica. -- 135: The oligotrophic heath vegetation of northern Fennoscandia and its zonation (1988). -- Helsinki : Societas pro Fauna et Flora Fennica, 1988. -- ISBN : 951-9469-29-X. -- ISSN : 0001-5369.
flóra. fauna. botanika. odborné časopisy
581.9. 591.9. 58. (051)-027.561