Ericsson, A., Lindgren, A., & Mattsson, A. (1983). Effects of cold-storage and planting date on subsequent growth, starch and nitrogen content in Scots pine (Pinus sylvestris) and Norway spruce (Picea abies) seedlings. Swedish University of Agricultural Sciences, Faculty of Forestry.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Ericsson, Anders, Anders Lindgren, و Anders Mattsson. Effects of Cold-storage and Planting Date on Subsequent Growth, Starch and Nitrogen Content in Scots Pine (Pinus Sylvestris) and Norway Spruce (Picea Abies) Seedlings. Uppsala, Sweden: Swedish University of Agricultural Sciences, Faculty of Forestry, 1983.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Ericsson, Anders, et al. Effects of Cold-storage and Planting Date on Subsequent Growth, Starch and Nitrogen Content in Scots Pine (Pinus Sylvestris) and Norway Spruce (Picea Abies) Seedlings. Swedish University of Agricultural Sciences, Faculty of Forestry, 1983.