Citazione Stile APA (7a Edizione)

Heap, G. (1992). Structures approach to systems development. McGraw-Hill.

Citazione stile Chigago Style (17a edizione)

Heap, Gary. Structures Approach to Systems Development. London: McGraw-Hill, 1992.

Citatione MLA (9a ed.)

Heap, Gary. Structures Approach to Systems Development. McGraw-Hill, 1992.