Gaya APA

Diwan, P. et al (2001). Graphical User Interface, IT Encyclopaedia. Com ( 6 ) (2nd Revised ed 2001). New Delhi: Pentagon Press.

Gaya MLA

Diwan, Parag. et al. "Graphical User Interface, IT Encyclopaedia. Com ( 6 )". 2nd Revised ed 2001 New Delhi: Pentagon Press, 2001. .