APA (7th ed.) Citation

Ibbotson, E., & Porter, S. (1999). The secret of platform 13. Puffin Books.

Chicago Style (17th ed.) Citation

Ibbotson, Eva, and Sue Porter. The Secret of Platform 13. New York: Puffin Books, 1999.

MLA (9th ed.) Citation

Ibbotson, Eva, and Sue Porter. The Secret of Platform 13. Puffin Books, 1999.