Sorcery! is a single-player four-part adventure gamebook series written by Steve Jackson and illustrated by John Blanche. Originally published by Penguin Books from 1983 to 1985, the titles form part of the Fighting Fantasy series, despite not being part of the formal chronology. The series was republished by Wizard Books from 2002 and will reappear in digital form in 2013.
The Sorcery! series was published from 1983 to 1985 as four individual titles, being The Shamutanti Hills; Khare: Cityport of Traps; The Seven Serpents and The Crown of Kings. Steve Jackson and John Blanche provided the writing and artwork on all titles.
Source: Wikipedia, "Sorcery!", available under the CC-BY-SA License.