Barnes, Ralph M. (Ralph Mosser)
John Wiley & Sons, 1961
Buku Teks
Eva Mardiani Suherman
2013
UI - Skripsi (Membership)
Hansen, Bertrand L.
Prentice-Hall, 1966
Buku Teks
Hamburg, Morris
Harcourt Brace Jovanovick, 1985
Buku Teks
Chao, Lincoln L.
Prentice-Hall, 1981
Buku Teks