APA (7th ed.) Citation

Andersen & Long. (1999). The emperor's new clothes. Ladybird Books.

Chicago Style (17th ed.) Citation

Andersen and Long. The Emperor's New Clothes. London: Ladybird Books, 1999.

MLA (8th ed.) Citation

Andersen and Long. The Emperor's New Clothes. Ladybird Books, 1999.