PARKINSON C NORTHCOTE. (1978). WATCH YOUR FIGURES. MACMILLAN.
Lua i Stíl Chicago (17ú heag.)PARKINSON C NORTHCOTE. WATCH YOUR FIGURES. DELHI: MACMILLAN, 1978.
Lua MLA (9ú heag.)PARKINSON C NORTHCOTE. WATCH YOUR FIGURES. MACMILLAN, 1978.
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