Johannisson, C. (1996). [Superscript 15]N abundance as an indicator of N-saturation of coniferous forest. Swedish University of Agricultural Sciences.
Lua i Stíl Chicago (17ú heag.)Johannisson, Christian. [Superscript 15]N Abundance as an Indicator of N-saturation of Coniferous Forest. Umeå: Swedish University of Agricultural Sciences, 1996.
Lua MLA (8ú heag.)Johannisson, Christian. [Superscript 15]N Abundance as an Indicator of N-saturation of Coniferous Forest. Swedish University of Agricultural Sciences, 1996.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.