Badger, Ralph Eastman. Investment principles and practices / Ralph E. Badger, Harold W. Torgerson [and] Harry G. Guthmann. - 6th ed. - Englewood Cliffs, N.J. : Prentice-Hall, 1969. - xxiv, 748 p. : ill. ISBN: 0135038626 LCCN: 93034350 Subjects--Topical Terms: Securities.Investments.