The Gamma-Ray Observatory.

APA Citation

United States. National Aeronautics and Space Administration. (1991). The Gamma-Ray Observatory. Rev. 2/91. [Washington, D.C.?]: National Aeronautics and Space Administration .

MLA Citation

United States. National Aeronautics and Space Administration. The Gamma-Ray Observatory. Rev. 2/91. [Washington, D.C.?]: National Aeronautics and Space Administration , 1991.

Warning: These citations may not always be complete (especially for serials).