APA (7th ed.) Citation

Gardiner. (2013). The shadow tracer. Penguin Books.

Chicago Style (17th ed.) Citation

Gardiner. The Shadow Tracer. London: Penguin Books, 2013.

MLA (8th ed.) Citation

Gardiner. The Shadow Tracer. Penguin Books, 2013.

Warning: These citations may not always be 100% accurate.