APA

Baxter، Nicola, Williams، Stuart, .the ugly duckling. london: ladybird،.

Chicago

Baxter، Nicola, Williams، Stuart, .the ugly duckling. london: ladybird،.

Harvard

Baxter، Nicola, Williams، Stuart, .the ugly duckling. london: ladybird،.

MLA

Baxter، Nicola, Williams، Stuart, .london: ladybird،. .