APA
Grieg E., Neupert E. & Engeset B. (2013). Olav Trygvason... [etc.]. [Europe]: Naxos rights international.
Chicago
Grieg Edvard, Neupert Edmnd and Engeset Bjarte. 2013. Olav Trygvason... [etc.]. [Europe]: Naxos rights international.
Harvard
Grieg E., Neupert E. and Engeset B. (2013). Olav Trygvason... [etc.]. [Europe]: Naxos rights international.
MLA
Grieg Edvard, Neupert Edmnd and Engeset Bjarte. Olav Trygvason... [etc.]. [Europe]: Naxos rights international. 2013.