Effective letters :
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.
Open access.
6412946
Commercial correspondence--Programmed instruction.
Open access.
6412946
Commercial correspondence--Programmed instruction.