STEINMETZ LAWRENCE L. (2006). HOW TO SELL AT MARGINS HIGHER THAN YOUR COMPETITORS. JOHN WILEY & SONS.
Lua i Stíl Chicago (17ú heag.)STEINMETZ LAWRENCE L. HOW TO SELL AT MARGINS HIGHER THAN YOUR COMPETITORS. NEW JERSEY: JOHN WILEY & SONS, 2006.
Lua MLA (9ú heag.)STEINMETZ LAWRENCE L. HOW TO SELL AT MARGINS HIGHER THAN YOUR COMPETITORS. JOHN WILEY & SONS, 2006.
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