Cita APA (7th ed.)

Discovery Channel School & ENTREX SOFTWARE. (2004). Viruses [computer file]. Discovery Communications, Inc.

Cita Chicago (17th ed.)

Discovery Channel School i ENTREX SOFTWARE. Viruses [computer File]. U.S.A: Discovery Communications, Inc, 2004.

Cita MLA (9th ed.)

Discovery Channel School i ENTREX SOFTWARE. Viruses [computer File]. Discovery Communications, Inc, 2004.