[en] [Gutenberg 9849] • The Brown Mask Dodo Press
[en] The Light That Lures Otbebookpublishing
[en] Christopher Quarles Otbebookpublishing
[en] [Gutenberg 34468] • Christopher Quarles: College Professor and Master Detective Classic Mysteries
[en] [Gutenberg 9796] • The Master Detective: Being Some Further Investigations of Christopher Quarles Kessinger Publishing
[en] [Gutenberg 39652] • Vayenne Kessinger Publishing