(1987). Project summaries: FY 1987: Directorate for scientific, technological, and international affairs national science foundation. Washington.
Trích dẫn kiểu ChicagoProject Summaries: FY 1987: Directorate for Scientific, Technological, and International Affairs National Science Foundation. Washington, 1987.
Trích dẫn MLAProject Summaries: FY 1987: Directorate for Scientific, Technological, and International Affairs National Science Foundation. Washington, 1987.
Cảnh báo: Các trích dẫn này có thể không phải lúc nào cũng chính xác 100%.