APA (7th ed.) Citation

Tveitt, G., Botnen, G., & Horvei, R. (1996). Fifty folk tunes from Hardanger. Simax.

Chicago Style (17th ed.) Citation

Tveitt, Geirr, Geir Botnen, and Reidun Horvei. Fifty Folk Tunes from Hardanger. [Oslo]: Simax, 1996.

MLA (9th ed.) Citation

Tveitt, Geirr, et al. Fifty Folk Tunes from Hardanger. Simax, 1996.