Fisher, Ronald A. Statistical methods for research workers / Ronald A.Fisher. - 13th ed. - Edinburgh, London : Oliver and Boyd, 1958. - 356 p. : ill. ; 23 cm. - Biological monographs and manuals/general editors F.A.E.Crew. . Includes bibliograpical references and index. Subjects--Topical Terms: Statistics. LC Class. No.: HA29 / .F58 1958