DICK - LARKAM R. (1973). PROFIT IMPROVEMENT TECHNIQUES. GOWER.
Lua i Stíl Chicago (17ú heag.)DICK - LARKAM R. PROFIT IMPROVEMENT TECHNIQUES. ESSEX: GOWER, 1973.
Lua MLA (9ú heag.)DICK - LARKAM R. PROFIT IMPROVEMENT TECHNIQUES. GOWER, 1973.
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