APA (7th ed.) Citation

Veronica Roth. (2014). Four: A Divergent Collection. HarperCollins Children's Books.

Chicago Style (17th ed.) Citation

Veronica Roth. Four: A Divergent Collection. London: HarperCollins Children's Books, 2014.

MLA (9th ed.) Citation

Veronica Roth. Four: A Divergent Collection. HarperCollins Children's Books, 2014.

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