Heap, G. (1992). Structures approach to systems development. McGraw-Hill.
Chicago-čujuhus (17. p.)Heap, Gary. Structures Approach to Systems Development. London: McGraw-Hill, 1992.
MLA-čujuhus (9. p.)Heap, Gary. Structures Approach to Systems Development. McGraw-Hill, 1992.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.