APA Style
User's Guide System Guide Programmer's Guide. (1985).
California:
Digital Research.
Chicago Style
User's Guide System Guide Programmer's Guide.
.
California:
Digital Research,
1985.
Text.
MLA Style
User's Guide System Guide Programmer's Guide.
.
California:
Digital Research,
1985.
Text.
Turabian Style
User's Guide System Guide Programmer's Guide.
California:
Digital Research,
1985.
Print.