APA (7th ed.) Citation

Christie,Agatha. (2002). The big four. HarperCollins Publishers.

Chicago Style (17th ed.) Citation

Christie,Agatha. The Big Four. London: HarperCollins Publishers, 2002.

MLA (9th ed.) Citation

Christie,Agatha. The Big Four. HarperCollins Publishers, 2002.

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