Saw, Ron
Richard Griffin, 1984
Buku Teks
compiled and edited by Bill Wannan
Macmillan, 1974
Buku Referensi
Williams, Kenneth
Billing & Sons Ltd , 1980
Buku Teks
Sari Endahwarni, author
1990
UI - Tesis (Membership)
Skinner, Cornelia Otis, author
Dodd, Mead, 1955
Buku Teks