Cita APA (7th ed.)

CALLAHAN, M., & NICKANIS. (1990). Guide to shareware: Dr. File Finders. McGraw Hill.

Cita Chicago (17th ed.)

CALLAHAN, Mike, i NICKANIS. Guide to Shareware: Dr. File Finders. New York: McGraw Hill, 1990.

Cita MLA (9th ed.)

CALLAHAN, Mike, i NICKANIS. Guide to Shareware: Dr. File Finders. McGraw Hill, 1990.