Sweetenham, J. G., & Esterson, D. M. j. a. (1966). Model answers in mathematics for A-level students. Pergamon.
Lua i Stíl Chicago (17ú heag.)Sweetenham, Joseph Gilford, agus Derek Montague joint auth Esterson. Model Answers in Mathematics for A-level Students. Oxford: Pergamon, 1966.
Lua MLA (9ú heag.)Sweetenham, Joseph Gilford, agus Derek Montague joint auth Esterson. Model Answers in Mathematics for A-level Students. Pergamon, 1966.
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