His Elementary statistics ... 1979: t.p. (Robert R. Johnson; Monroe Community Coll., Rochester, N. Y.) CIP data sheet (b. 10/29/39)

Phone call to the college, 7/18/78 (Robert Russell Johnson)

His Elementary statistics, c1984: t.p. (Robert Johnson)

Biblioteca del congreso (Estados Unidos), 18 septiembre 2018: catálogo electrónico https://goo.gl/HDBDor

Estadística elemental,1990: portada (Robert Johnson)