Gray, E. (2009). Skills builder for young learners: 1 starters (1st pub., 3rd impr.). Express Publishing.
Chicago-Zitierstil (17. Ausg.)Gray, Elizabeth. Skills Builder for Young Learners: 1 Starters. 1st pub., 3rd impr. Berkshire, UK: Express Publishing, 2009.
MLA-Zitierstil (9. Ausg.)Gray, Elizabeth. Skills Builder for Young Learners: 1 Starters. 1st pub., 3rd impr. Express Publishing, 2009.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.