CALLAHAN, M., & NICKANIS. (1990). Guide to shareware: Dr. File Finders. McGraw Hill.
芝加哥风格引文CALLAHAN, Mike, 与 NICKANIS. Guide to Shareware: Dr. File Finders. New York: McGraw Hill, 1990.
MLA引文CALLAHAN, Mike, 与 NICKANIS. Guide to Shareware: Dr. File Finders. McGraw Hill, 1990.
警告：这些引文格式不一定是100％准确.