APA

National Science Foundation (Washington D. C.). Research Applications Directorate, . (1973). Exploratory research and problem assessment. Washington, D. C: National Science Foundation.

Chicago

National Science Foundation (Washington D. C.). Research Applications Directorate, . 1973. Exploratory research and problem assessment. Washington, D. C: National Science Foundation.

Harvard

National Science Foundation (Washington D. C.). Research Applications Directorate, . (1973). Exploratory research and problem assessment. Washington, D. C: National Science Foundation.

MLA

National Science Foundation (Washington D. C.). Research Applications Directorate, . Exploratory research and problem assessment. Washington, D. C: National Science Foundation. 1973.