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.
Παραπομπή σε μορφή Chicago (17η εκδ.)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.
Παραπομπή σε μορφή MLA (8th εκδ.)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.
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