Tepper, Ron The only 250 letters and memos managers will ever need / Ron Tepper - New York : John Wiley, c1990. - vii, 278 p. : 29 cm. ISBN: 047152459X LCCN: Subjects--Topical Terms: Commercial correspondence.Memorandums. LC Class. No.: T310 / . 1990 Dewey Class. No.: 651.7