TOKHEIM, R. L. (1994). Theory and problems of digital principles.-- ed.3. McGraw-Hill.
芝加哥风格引文TOKHEIM, Roger L. Theory and Problems of Digital Principles.-- Ed.3. New York: McGraw-Hill, 1994.
MLA引文TOKHEIM, Roger L. Theory and Problems of Digital Principles.-- Ed.3. McGraw-Hill, 1994.
警告：这些引文格式不一定是100％准确.