|The Devil and Tom Walker 1824-Source of the Oak Island Hoax|
You can read The Devil and Tom Walker online here in the book of short stories "Tales of a Traveler" by Washington Irving from 1824 in various formats.
William Kidd is the back story apparently for the Tom Walker story and there is a separate story about William Kidd in the book. I think what they are saying is William Kidd is the back story in the adventure of Tom Walker.
This is in the public domain and anyone can use them for free.