APA استشهاد

Germany. The Federal Minister for Research and Technology. (1989). Environmental research and technology: Programme 1989-1994. The Federal Minister for Research and Technology.

استشهاد بنمط شيكاغو

Germany. The Federal Minister for Research and Technology. Environmental Research and Technology: Programme 1989-1994. Bonn: The Federal Minister for Research and Technology, 1989.

MLA استشهاد

Germany. The Federal Minister for Research and Technology. Environmental Research and Technology: Programme 1989-1994. The Federal Minister for Research and Technology, 1989.