Westwater, E. (1960). Simplified Calculus (1st.). English Universities Press Ltd.
Lua i Stíl Chicago (17ú heag.)Westwater, E. Simplified Calculus. 1st. London: English Universities Press Ltd, 1960.
Lua MLA (9ú heag.)Westwater, E. Simplified Calculus. 1st. English Universities Press Ltd, 1960.
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