APA

Cheung L., . (2007). The 10 greatest 21 st century innovations. New York: Scholastic.

Chicago

Cheung Lisa, . 2007. The 10 greatest 21 st century innovations. New York: Scholastic.

Harvard

Cheung L., . (2007). The 10 greatest 21 st century innovations. New York: Scholastic.

MLA

Cheung Lisa, . The 10 greatest 21 st century innovations. New York: Scholastic. 2007.