ebrary, Inc. (2005). Polar icebreaker roles and U.S. future needs: A preliminary assessment. National Academy Press.
芝加哥风格引文ebrary, Inc. Polar Icebreaker Roles and U.S. Future Needs: A Preliminary Assessment. Washington, D.C.: National Academy Press, 2005.
MLA引文ebrary, Inc. Polar Icebreaker Roles and U.S. Future Needs: A Preliminary Assessment. National Academy Press, 2005.
警告：这些引文格式不一定是100％准确.