MLA

Wergeland, H, and S Westin. A Manybody Problem for Students. Trondheim: Tapir Forlag, 1986.

APA

Wergeland, H., & Westin, S. (1986). A manybody problem for students. Trondheim: Tapir Forlag.

Chicago

Wergeland, H., and S Westin. A Manybody Problem for Students. Trondheim: Tapir Forlag, 1986.