APA
Aamlid D., Venn K. & Stuanes A. O. (1990). Forest decline in Norway: monitoring results, international links and hypotheses. As: Norwegian Agricultural Advisory Centre.
Chicago
Aamlid Dan, Venn Kare and Stuanes Arne O. 1990. Forest decline in Norway: monitoring results, international links and hypotheses. As: Norwegian Agricultural Advisory Centre.
Harvard
Aamlid D., Venn K. and Stuanes A. O. (1990). Forest decline in Norway: monitoring results, international links and hypotheses. As: Norwegian Agricultural Advisory Centre.
MLA
Aamlid Dan, Venn Kare and Stuanes Arne O. Forest decline in Norway: monitoring results, international links and hypotheses. As: Norwegian Agricultural Advisory Centre. 1990.