APA

Wilson R., Williams M., . (2013). Butterflies and frogs. [London]: Pearson Education.

Chicago

Wilson Rachel, Williams Melanie, . 2013. Butterflies and frogs. [London]: Pearson Education.

Harvard

Wilson R., Williams M., . (2013). Butterflies and frogs. [London]: Pearson Education.

MLA

Wilson Rachel, Williams Melanie, . Butterflies and frogs. [London]: Pearson Education. 2013.