Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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