Greer, A. (1992). A complete GCSE mathematics: Higher course (3rd ed.). Stanley Thornes.
Lua i Stíl Chicago (17ú heag.)Greer, A. A Complete GCSE Mathematics: Higher Course. 3rd ed. London: Stanley Thornes, 1992.
Lua MLA (9ú heag.)Greer, A. A Complete GCSE Mathematics: Higher Course. 3rd ed. Stanley Thornes, 1992.
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