APA (7th ed.) Citation

Christie, A. (1986). The secret of Chimneys ([1st published], repr. 1986.). Triad Grafton.

Chicago Style (17th ed.) Citation

Christie, Agatha. The Secret of Chimneys. [1st published], repr. 1986. London [etc.]: Triad Grafton, 1986.

MLA (9th ed.) Citation

Christie, Agatha. The Secret of Chimneys. [1st published], repr. 1986. Triad Grafton, 1986.

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