Hagner, M. (1970). A genecological investigation of the annual rhythm of Pinus silvestris L: En genekologisk undersökning av årsrytmen hos Pinus silvestris L. Royal College of Forestry.
Lua i Stíl Chicago (17ú heag.)Hagner, Mats. A Genecological Investigation of the Annual Rhythm of Pinus Silvestris L: En Genekologisk Undersökning Av årsrytmen Hos Pinus Silvestris L. Stockholm: Royal College of Forestry, 1970.
Lua MLA (8ú heag.)Hagner, Mats. A Genecological Investigation of the Annual Rhythm of Pinus Silvestris L: En Genekologisk Undersökning Av årsrytmen Hos Pinus Silvestris L. Royal College of Forestry, 1970.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.