If not, any complete list of his writing should include not only interviews but published letters and book and film endorsements.
Question from another forum: http://forums.abebooks.com/discussions/AbeBookscom_BookSleuthreg/General/Mystery_Book_endorsed_by_Stephen_King/abesleuthcom/34590.1?nav=messages
Question from another forum: http://forums.abebooks.com/discussions/AbeBookscom_BookSleuthreg/General/Mystery_Book_endorsed_by_Stephen_King/abesleuthcom/34590.1?nav=messages