Walker, M. (1990). Kids: An english course: activity book. Addison-Wesley Publishing Company.
Citazione stile Chigago Style (17a edizione)Walker, Michael. Kids: An English Course: Activity Book. New York, EUA: Addison-Wesley Publishing Company, 1990.
Citatione MLA (9a ed.)Walker, Michael. Kids: An English Course: Activity Book. Addison-Wesley Publishing Company, 1990.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.