APA (7th ed.) Citation

Bourget, P. C. J. (1920). The blue duchess. Collins.

Chicago Style (17th ed.) Citation

Bourget, Paul Charles Joseph. The Blue Duchess. London: Collins, 1920.

MLA (8th ed.) Citation

Bourget, Paul Charles Joseph. The Blue Duchess. Collins, 1920.

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