Norwegian music publication since 1800 :
a preliminary guide to music publishers, printers and dealers /
Dan Fog and Kari Michelsen.

APA Citation

Fog, D., Michelsen, K. (1976). Norwegian music publication since 1800: a preliminary guide to music publishers, printers and dealers. Copenhagen: Dan Fog.

MLA Citation

Fog, Dan, and Kari Michelsen. Norwegian Music Publication Since 1800: a Preliminary Guide to Music Publishers, Printers And Dealers. Copenhagen: Dan Fog, 1976.

Warning: These citations may not always be complete (especially for serials).