N.Y. AHI , 19-
Buku Teks
by John P. Campbell ... [and others]
McGraw-Hill, 1970
Buku Teks
Bellows, Roger, author
Prentice-Hall, 1962
Buku Teks
Bender, James F., author
McGraw-Hill, 1950
Buku Teks
Heyel, Carl, author
American Management Association, 1958
Buku Teks