Brewster was the author of Essays in Trade and Navigation. In Five Parts, London 1695. The first part only was published; but in 1702 he issued New Essays on Trade, wherein the present state of our Trade, its great decay in the chief branches of it, and the fatal consequences thereof to the Nation (unless timely remedy'd), is considered under the most important heads of Trade and Navigation, London. An anonymous book has also been ascribed to him: A Discourse concerning Ireland and the different Interests thereof; in answer to the Exon and Barnstaple Petitions; shewing that if a Law were enacted to prevent the exportation of Woollen Manufactures from Ireland to Foreign Parts, what the consequences thereof would be both to England and Ireland, London 1698.