APA (7th ed.) Citation

Christie, A. (1998). While the light lasts. HarperCollins Publishers.

Chicago Style (17th ed.) Citation

Christie, Agatha. While the Light Lasts. London: HarperCollins Publishers, 1998.

MLA (9th ed.) Citation

Christie, Agatha. While the Light Lasts. HarperCollins Publishers, 1998.

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