Langton, D., & Campbell, A. (2011). Visual marketing: 99 proven ways for small businesses to market with images and design. Wiley.
Lua i Stíl Chicago (17ú heag.)Langton, David, agus Anita Campbell. Visual Marketing: 99 Proven Ways for Small Businesses to Market with Images and Design. Hoboken, N.J.: Wiley, 2011.
Lua MLA (9ú heag.)Langton, David, agus Anita Campbell. Visual Marketing: 99 Proven Ways for Small Businesses to Market with Images and Design. Wiley, 2011.
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