APA
(1997). Visual Basic version 5.0 programmer's guide: programming system for windows 95 and windows NT. United State of America: Microsoft Corporation.
Chicago
1997. Visual Basic version 5.0 programmer's guide: programming system for windows 95 and windows NT. United State of America: Microsoft Corporation.
Harvard
(1997). Visual Basic version 5.0 programmer's guide: programming system for windows 95 and windows NT. United State of America: Microsoft Corporation.
MLA
Visual Basic version 5.0 programmer's guide: programming system for windows 95 and windows NT. United State of America: Microsoft Corporation. 1997.