Cunningham, G. (1988). Language to go: Pre-intermediate, students' book. Longman.
Cita Chicago Style (17a ed.)Cunningham, Gillie. Language to Go: Pre-intermediate, Students' Book. England: Longman, 1988.
Cita MLA (9a ed.)Cunningham, Gillie. Language to Go: Pre-intermediate, Students' Book. Longman, 1988.
警告：这些引文格式不一定是100％准确.