Opie, I. A., & Opie, P. (2008). Children's games in street and playground. Floris Books.
Citazione stile Chigago Style (17a edizione)Opie, Iona Archibald, e Peter Opie. Children's Games in Street and Playground. Edinburgh, U.K: Floris Books, 2008.
Citatione MLA (9a ed.)Opie, Iona Archibald, e Peter Opie. Children's Games in Street and Playground. Floris Books, 2008.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.