Marcus, Edward
Pitman, 1965
Buku Teks
White, Robert W.
Prentice-Hall, 1996
Buku Teks
Dunning, John H.
George Allen and Unwin , 1974
Buku Teks
Gipson, Carolyn R.
McGraw-Hill, 1994
Buku Referensi
Advensius Cristian
Universitas Indonesia, 2017
UI - Tesis Membership