Text ( visual ) : unmediated Introduction to the study of economics / by Charles J. Bullock. -- 4th ed., rev. and enl. -- Boston ; New York : Silver, Burdett , 1913. -- 621 p. ; 20 cm. -- Bibliography: p. 589-609 ; Includes index. -- (BA23736534) ; https://ci.nii.ac.jp/ncid/BA23736534 Author Heading(s): Bullock, Charles Jesse