Robinson, Webster, author
McGraw-Hill, 1925
Buku Teks
Duttn, Henry P.
McGraw-Hill Book Company, Inc., 1931
Buku Teks
Moore, Herbert, author
McGraw-Hill, 1942
Buku Teks
Coleman, Richard M., author
American Management Association, 1995
eBooks
Kimball, Dexter S
McGraw-Hi, 1947
Buku Teks