APA (7th ed.) Citation

Rumar, K., As, B., & Gunnarsson, S. O. (1966). Studies in traffic. Munksgaard.

Chicago Style (17th ed.) Citation

Rumar, Kåre, Berit As, and S. O. Gunnarsson. Studies in Traffic. Copenhagen: Munksgaard, 1966.

MLA (9th ed.) Citation

Rumar, Kåre, et al. Studies in Traffic. Munksgaard, 1966.