APA-viite (7. p.)
Barnard, W., & Wallace, T. F. (1994). The innovation edge: Creating strategic breakthroughs using the voice of the customer. Omne�o.
Chicago-viite (17. p.)
Barnard, William, ja Thomas F. Wallace. The Innovation Edge: Creating Strategic Breakthroughs Using the Voice of the Customer. Essex Junction, VT: Omne�o, 1994.
MLA-viite (9. p.)
Barnard, William, ja Thomas F. Wallace. The Innovation Edge: Creating Strategic Breakthroughs Using the Voice of the Customer. Omne�o, 1994.
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