William Howarth is the author of Greenwich: Past and Present, Characteristics of Cotton Required by the Spinner, and Present Defects in the Raw Material (1921), Barclay & Company, Limited: Being a History of the Old Banking Firm of Barclay & Company, and Also of the Various Institutions which Have Been ... Amalgamated with ... Them, Etc (1901), A Logical Justification of Legal Reasoning (1983), Lesiglation Governing Shrimp Aquaculture (2001).