Cita APA (7th ed.)

Cunningham, G. (1988). Language to go: Pre-intermediate, students' book. Longman.

Cita Chicago (17th ed.)

Cunningham, Gillie. Language to Go: Pre-intermediate, Students' Book. England: Longman, 1988.

Cita MLA (9th ed.)

Cunningham, Gillie. Language to Go: Pre-intermediate, Students' Book. Longman, 1988.