APA-referens (7:e uppl.)

Smith, E. (1987). Examples in mathematics for GCSE: Higher level. Stanley Thornes.

Chicago-referens (17:e uppl.)

Smith, Ewart. Examples in Mathematics for GCSE: Higher Level. Cheltenhorn, England: Stanley Thornes, 1987.

MLA-referens (9:e uppl.)

Smith, Ewart. Examples in Mathematics for GCSE: Higher Level. Stanley Thornes, 1987.