Cita APA (7th ed.)
Greer, A. (1992). A complete GCSE mathematics: Higher course (3rd ed.). Stanley Thornes Ltd.
Cita Chicago (17th ed.)
Greer, A. A Complete GCSE Mathematics: Higher Course. 3rd ed. Cheltenham, UK: Stanley Thornes Ltd, 1992.
Cita MLA (9th ed.)
Greer, A. A Complete GCSE Mathematics: Higher Course. 3rd ed. Stanley Thornes Ltd, 1992.
Atenció: Aquestes cites poden no estar 100% correctes.