LAWLOR ALAN. (1987). PRODUCTIVITY IMPROVEMENT MANUAL. GOWER.
Lua i Stíl Chicago (17ú heag.)LAWLOR ALAN. PRODUCTIVITY IMPROVEMENT MANUAL. ENGLAND: GOWER, 1987.
Lua MLA (9ú heag.)LAWLOR ALAN. PRODUCTIVITY IMPROVEMENT MANUAL. GOWER, 1987.
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