Gericke, Helmuth. Geschichte des Zahlbegriffs / Helmuth Gericke - Mannheim, Bibliographisches Institut [c1970] - 163 p. illus. 19 cm. - B. I.-Hochschultaschenbucher, 172/172a . Bibliography: p. [140]-154. LCCN: 70516030 Subjects--Topical Terms: Number theory--History. LC Class. No.: QA241 / .G45 Dewey Class. No.: 510.9 512.7