APA (7th ed.) Citation

Christie, A. (1948). The mystery of the blue train. Penguin.

Chicago Style (17th ed.) Citation

Christie, Agatha. The Mystery of the Blue Train. Harmondsworth, Middlesex: Penguin, 1948.

MLA (8th ed.) Citation

Christie, Agatha. The Mystery of the Blue Train. Penguin, 1948.

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