Coming in fall 2018: Sherlock Holmes Is Like, an anthology with 60 authors considering Sherlock Holmes in the light of Houdini, Loki, Hamlet, Batman, Scully, and 55 other characters
In Bed with Sherlock Holmes (Dundurn Press), now out of print, but see web page
Welcome to America, Mr. Sherlock Holmes (Dundurn Press), now out of print
A Sherlock Holmes Handbook (Dundurn Press) — first edition (1993) officially out of print, but email me for information about direct purchase. Second edition (2009) is available from the publisher
Quotations from Baker Street (privately published, available from me for $10 postpaid or will trade for suitable consideration)