Hämäläinen, M. (1991). Principal variations in the chemical composition of peat. Swedish University of Agricultural Sciences, Dept. of Chemistry.
Chicago-referens (17:e uppl.)Hämäläinen, Markku. Principal Variations in the Chemical Composition of Peat. Uppsala, Sweden: Swedish University of Agricultural Sciences, Dept. of Chemistry, 1991.
MLA-referens (8:e uppl.)Hämäläinen, Markku. Principal Variations in the Chemical Composition of Peat. Swedish University of Agricultural Sciences, Dept. of Chemistry, 1991.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.