APA (7th ed.) Citation

Brunberg, M. R., Shakespeare, W., & Østermark, M. H. (2017). Centuries of summer days. Gateway Music.

Chicago Style (17th ed.) Citation

Brunberg, Mie Rank, William Shakespeare, and Margit Haahr Østermark. Centuries of Summer Days. [Denmark?]: Gateway Music, 2017.

MLA (9th ed.) Citation

Brunberg, Mie Rank, et al. Centuries of Summer Days. Gateway Music, 2017.