Ries , A. &. (1990). Bottom-up marketing. Penguin.
Chicago-čujuhus (17. p.)Ries , Al &Trout. Bottom-up Marketing. New York: Penguin, 1990.
MLA-čujuhus (9. p.)Ries , Al &Trout. Bottom-up Marketing. Penguin, 1990.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.