Παραπομπή σε μορφή APA (7η εκδ.)

Vadla, K. (1989). Stammekvisting av gran (Picea abies (L.) Karst.) =: Pruning of Norway spruce (Pices abies (L.) Karst.). Norsk institutt for skogforskning.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Vadla, Kjell. Stammekvisting Av Gran (Picea Abies (L.) Karst.) =: Pruning of Norway Spruce (Pices Abies (L.) Karst.). Ås [Norway]: Norsk institutt for skogforskning, 1989.

Παραπομπή σε μορφή MLA (8th εκδ.)

Vadla, Kjell. Stammekvisting Av Gran (Picea Abies (L.) Karst.) =: Pruning of Norway Spruce (Pices Abies (L.) Karst.). Norsk institutt for skogforskning, 1989.