APA (7th ed.) Citation

United States. National Aeronautics and Space Administration. (1998). Explorer program announcement of opportunity: University-class explorer and missions of opportunity. National Aeronautics and Space Administration.

Chicago Style (17th ed.) Citation

United States. National Aeronautics and Space Administration. Explorer Program Announcement of Opportunity: University-class Explorer and Missions of Opportunity. [Washington, D.C.]: National Aeronautics and Space Administration, 1998.

MLA (9th ed.) Citation

United States. National Aeronautics and Space Administration. Explorer Program Announcement of Opportunity: University-class Explorer and Missions of Opportunity. National Aeronautics and Space Administration, 1998.