Butler, D. (2008). Business planning. Penguin Books.
Chicago-čujuhus (17. p.)Butler, David. Business Planning. New Delhi: Penguin Books, 2008.
MLA-čujuhus (9. p.)Butler, David. Business Planning. Penguin Books, 2008.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.