Craig, William. Logic in algebraic form; Three languages and theories. - Amsterdam ;: New York: North-Holland, American Elsevier, 1974. - viii, 204 p.: 23 cm. - Studies in logic and the foundations of mathematics v. 72. . Bibliography: p. 182-183. ISBN: 0444104771 (American Elsevier) LCCN: 72088292 Nat. Bib. No.: Ne74-3 Subjects--Topical Terms: Algebraic logic.Proof theory Dewey Class. No.: 511.3 / C886l