Cita APA (7a ed.)

THE HELIOS OPERATING.. (1989). The helios operating system: Perihelion software ltd. Prentice Hall.

Cita Chicago Style (17a ed.)

THE HELIOS OPERATING.. The Helios Operating System: Perihelion Software Ltd. New York: Prentice Hall, 1989.

Cita MLA (9a ed.)

THE HELIOS OPERATING.. The Helios Operating System: Perihelion Software Ltd. Prentice Hall, 1989.