THE HELIOS OPERATING.. (1989). The helios operating system: Perihelion software ltd. Prentice Hall.
芝加哥风格引文THE HELIOS OPERATING.. The Helios Operating System: Perihelion Software Ltd. New York: Prentice Hall, 1989.
MLA引文THE HELIOS OPERATING.. The Helios Operating System: Perihelion Software Ltd. Prentice Hall, 1989.
警告：这些引文格式不一定是100％准确.