Fifield, P. (2007). Marketing strategy: The difference between marketing and markets (third.). Butterworth Heinemnn.
Lua i Stíl Chicago (17ú heag.)Fifield, Paul. Marketing Strategy: The Difference Between Marketing and Markets. third. Oxford: Butterworth Heinemnn, 2007.
Lua MLA (9ú heag.)Fifield, Paul. Marketing Strategy: The Difference Between Marketing and Markets. third. Butterworth Heinemnn, 2007.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.