Callahan, D. (1995). Setting limits: Medical goals in an aging society. Georgetown University Press.
芝加哥风格引文Callahan, Daniel. Setting Limits: Medical Goals in an Aging Society. Washington, D.C.: Georgetown University Press, 1995.
MLA引文Callahan, Daniel. Setting Limits: Medical Goals in an Aging Society. Georgetown University Press, 1995.
警告：这些引文格式不一定是100％准确.