APA (7th ed.) Citation

Vivian, S. (2016). The last boy and girl in the world. Simon & Schuster BFYR.

Chicago Style (17th ed.) Citation

Vivian, Siobhan. The Last Boy and Girl in the World. New York: Simon & Schuster BFYR, 2016.

MLA (9th ed.) Citation

Vivian, Siobhan. The Last Boy and Girl in the World. Simon & Schuster BFYR, 2016.

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