APA (7th ed.) Citation

National Science Foundation (U.S.) & Machen, M. M. (1993). Academic science and engineering: R&D expenditures, fiscal year 1991. National Science Foundation.

Chicago Style (17th ed.) Citation

National Science Foundation (U.S.) and M. Marge Machen. Academic Science and Engineering: R&D Expenditures, Fiscal Year 1991. Washington, D.C.: National Science Foundation, 1993.

MLA (9th ed.) Citation

National Science Foundation (U.S.) and M. Marge Machen. Academic Science and Engineering: R&D Expenditures, Fiscal Year 1991. National Science Foundation, 1993.