(1987). Project summaries: FY 1987: Directorate for scientific, technological, and international affairs national science foundation. Washington.
استشهاد بنمط شيكاغوProject Summaries: FY 1987: Directorate for Scientific, Technological, and International Affairs National Science Foundation. Washington, 1987.
MLA استشهادProject Summaries: FY 1987: Directorate for Scientific, Technological, and International Affairs National Science Foundation. Washington, 1987.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.