APA
(1993). Microsoft Mail for Windows version 3.0b or later step by step and Microsoft Schedule+. Washington: Microsoft.
Chicago
1993. Microsoft Mail for Windows version 3.0b or later step by step and Microsoft Schedule+. Washington: Microsoft.
Harvard
(1993). Microsoft Mail for Windows version 3.0b or later step by step and Microsoft Schedule+. Washington: Microsoft.
MLA
Microsoft Mail for Windows version 3.0b or later step by step and Microsoft Schedule+. Washington: Microsoft. 1993.