APA

Martinez R., Spatz C., . (2007). Old Macdonald had a farm. London: usborne publishing.

Chicago

Martinez Rocio, Spatz Caroline, . 2007. Old Macdonald had a farm. London: usborne publishing.

Harvard

Martinez R., Spatz C., . (2007). Old Macdonald had a farm. London: usborne publishing.

MLA

Martinez Rocio, Spatz Caroline, . Old Macdonald had a farm. London: usborne publishing. 2007.