John Woolman from the Heath Anthology site
Woolman: The Story of a Quaker Conscience" by Walter and Mildred Kahoe
Woolman, Quintessential Quaker" at quakerinfo.com
Reuben's PAL site has a bibliography on Woolman and information about
John Woolman Memorial Association (genealogy
site) has a picture of a house built in what was his orchard.