Heredia, R. (1978). Business planning (1st.). Noble.
Chicago-čujuhus (17. p.)Heredia, R. Business Planning. 1st. Bombay: Noble, 1978.
MLA-čujuhus (9. p.)Heredia, R. Business Planning. 1st. Noble, 1978.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.