GILBREATH ROBERT D. (1987). FORWARD THINKING: THE PRAGMATISTS GUIDE TO TODAY`S BUSINESS TRENDS. MCGRAW-HILL.
Lua i Stíl Chicago (17ú heag.)GILBREATH ROBERT D. FORWARD THINKING: THE PRAGMATISTS GUIDE TO TODAY`S BUSINESS TRENDS. LONDON: MCGRAW-HILL, 1987.
Lua MLA (9ú heag.)GILBREATH ROBERT D. FORWARD THINKING: THE PRAGMATISTS GUIDE TO TODAY`S BUSINESS TRENDS. MCGRAW-HILL, 1987.
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