Johannisson, C. (1996). [Superscript 15]N abundance as an indicator of N-saturation of coniferous forest. Swedish University of Agricultural Sciences.
Chicago-referens (17:e uppl.)Johannisson, Christian. [Superscript 15]N Abundance as an Indicator of N-saturation of Coniferous Forest. Umeå: Swedish University of Agricultural Sciences, 1996.
MLA-referens (8:e uppl.)Johannisson, Christian. [Superscript 15]N Abundance as an Indicator of N-saturation of Coniferous Forest. Swedish University of Agricultural Sciences, 1996.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.