Hämäläinen, M. (1991). Principal variations in the chemical composition of peat. Swedish University of Agricultural Sciences, Dept. of Chemistry.
Lua i Stíl Chicago (17ú heag.)Hämäläinen, Markku. Principal Variations in the Chemical Composition of Peat. Uppsala, Sweden: Swedish University of Agricultural Sciences, Dept. of Chemistry, 1991.
Lua MLA (8ú heag.)Hämäläinen, Markku. Principal Variations in the Chemical Composition of Peat. Swedish University of Agricultural Sciences, Dept. of Chemistry, 1991.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.