ebrary, Inc. (1999). Observations on the President's fiscal year 1999 federal science and technology budget. National Academy Press.
芝加哥风格引文ebrary, Inc. Observations on the President's Fiscal Year 1999 Federal Science and Technology Budget. Washington, D.C.: National Academy Press, 1999.
MLA引文ebrary, Inc. Observations on the President's Fiscal Year 1999 Federal Science and Technology Budget. National Academy Press, 1999.
警告：这些引文格式不一定是100％准确.