Okun, Mitchell. The challenge of America [electronic resource] / [by] Mitchell Okun, Stephen H. Bronz [and] William N. Murphy.. — Teacher's ed.. — New York, : Holt, Rinehart and Winston, [1973]. — 46, xvi, 816 p. : illus. 24 cm.
Includes 46 p. at the beginning and annotations interspersed in the text intended for the teacher; this material is by W. N. Murphy and H. P. Jennings.