APA

(2008). The secret of Whispering Island. Stuttgart: Ernst Klett Verlag.

Chicago

2008. The secret of Whispering Island. Stuttgart: Ernst Klett Verlag.

Harvard

(2008). The secret of Whispering Island. Stuttgart: Ernst Klett Verlag.

MLA

The secret of Whispering Island. Stuttgart: Ernst Klett Verlag. 2008.