Παραπομπή σε μορφή APA (7η εκδ.)

Arvidsson, H. (2001). Wood ash application in spruce stands: Effects on ground vegetation, tree nutrient status and soil chemistry. Swedish University of Agricultural Sciences.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Arvidsson, Helen. Wood Ash Application in Spruce Stands: Effects on Ground Vegetation, Tree Nutrient Status and Soil Chemistry. Uppsala: Swedish University of Agricultural Sciences, 2001.

Παραπομπή σε μορφή MLA (8th εκδ.)

Arvidsson, Helen. Wood Ash Application in Spruce Stands: Effects on Ground Vegetation, Tree Nutrient Status and Soil Chemistry. Swedish University of Agricultural Sciences, 2001.