Effective letters :  a program for self-instruction, prepared by the Programmed Instruction unit of the McGraw-Hill training materials and Information services division / 
edited by Robert M. Wendlinger. 
 - New York :  McGraw-Hill,  1964 
 - x, 321 p. :  illus. ;  24 cm. 
<br/><br/> Open access. 
<br/><br/><label>LCCN: </label>6412946  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Commercial correspondence--Programmed instruction.