Ries, A. (1986). Positioning. Warner Books.
Chicago-čujuhus (17. p.)Ries, Al. Positioning. New York: Warner Books, 1986.
MLA-čujuhus (9. p.)Ries, Al. Positioning. Warner Books, 1986.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.