APA

ASHWORTH J., CLARK J., . (2002). I-Spy. Oxford: Oxford University Press.

Chicago

ASHWORTH Julie, CLARK John, . 2002. I-Spy. Oxford: Oxford University Press.

Harvard

ASHWORTH J., CLARK J., . (2002). I-Spy. Oxford: Oxford University Press.

MLA

ASHWORTH Julie, CLARK John, . I-Spy. Oxford: Oxford University Press. 2002.