APA (7th ed.) Citation

Thelen, P., Koch, G., & Luxem, E. (1969). Deutsche Bundespost. RKW.

Chicago Style (17th ed.) Citation

Thelen, Peter, G. Koch, and E. Luxem. Deutsche Bundespost. Frankfurt: RKW, 1969.

MLA (9th ed.) Citation

Thelen, Peter, et al. Deutsche Bundespost. RKW, 1969.