Cita APA (7th ed.)

Haag, S., & Cummings, M. (2006). Information Systems Essentials. McGraw Hill.

Cita Chicago (17th ed.)

Haag, Stephen, i Maeve Cummings. Information Systems Essentials. Boston: McGraw Hill, 2006.

Cita MLA (9th ed.)

Haag, Stephen, i Maeve Cummings. Information Systems Essentials. McGraw Hill, 2006.