APA (7th ed.) Citation

Adobe Systems. (1997). Adobe photoshop version 4.0. Adobe press.

Chicago Style (17th ed.) Citation

Adobe Systems. Adobe Photoshop Version 4.0. [San Jose, Calif.]: Adobe press, 1997.

MLA (9th ed.) Citation

Adobe Systems. Adobe Photoshop Version 4.0. Adobe press, 1997.

Warning: These citations may not always be 100% accurate.