- see History of Logic Programming for further information.
- see Logical Necessity of Inconsistency for further information.
- see Carl Hewitt on Citizendium for further information
- see Carl Hewitt on Windows Live for further information.
- see Carl Hewitt on WordPress for further information.
- see Carl Hewitt on LiveJournal for further information.
- see Carl Hewitt on Blog.com for further information
- see Carl Hewitt on Bloglines for further information.
- see Carl Hewitt on Yahoo for further information.
- see Carl Hewitt on TypePad for further information.
