Viewpoint.

MLA

Brunner, E, W Rotzler, and F Hohler. Viewpoint. Zürich: ABC Verlag, 1987.

APA

Brunner, E., Rotzler, W., & Hohler, F. (1987). Viewpoint. Zürich: ABC Verlag.

Chicago

Brunner, E., W Rotzler, and F Hohler. Viewpoint. Zürich: ABC Verlag, 1987.