Custis, Vanderveer
Macmillan, 1923
Buku Teks
Sheth, Jagdish N., author
Free Press, 2002
Buku Teks
Mohammad Sadli, 1922-2008, author
Fakultas Ekonomi Universitas Indonesia, [date of publication no identified]
Buku Teks
Shepherd, William G., author
Prentice-Hall, 1979
Buku Teks
Lesourne, Jacques
Englewood Cliffs, N.J., Prentice-Hall
Buku Teks