Crane, Donald P.
Kent publishing company, 1986
Buku Teks
Werther, William B., author
McGraw-Hill, 1986
Buku Teks
Werther, William B., author
McGraw-Hill, 1993
Buku Teks
Greenlaw, Paul S.
Harper & Row, 1986
Buku Teks
Odiorne, George S.
Dow Jones-Irwin , 1982
Buku Teks