Citazione Stile APA (7a Edizione)

Brekke, A., & Egeland, A. (1994). The northern lights: Their heritage and science. Grndahl Dreyer.

Citazione stile Chigago Style (17a edizione)

Brekke, Asgeir, e Alv Egeland. The Northern Lights: Their Heritage and Science. Oslo: Grndahl Dreyer, 1994.

Citatione MLA (8a ed.)

Brekke, Asgeir, e Alv Egeland. The Northern Lights: Their Heritage and Science. Grndahl Dreyer, 1994.