"The Power of Two: Bonus Outtakes From WD Interview With Lincoln Child & Douglas Preston". Interview with Brian A. Klems, www.writersdigest.com. January 12, 2012.
Nicholas Culpeper, Parkins (1814). “The English Physician; Enlarged with Three Hundred and Sixty-nine Medicines Made of English Herbs: Not in Any Former Impression of Culpeper's British Herbal ... to which is Added The Family Physician ... and A Present for the Ladies”, p.350