Kane, Gerry, author
Prentice-Hall, 1992
Buku Referensi
Tabak, Daniel, author
England Research Studies Press, 1990
Buku Teks
Artikel Jurnal
Prentice-Hall, 1990
Buku Teks
Agoes Ariesmunandar ; Davison, Julian ; Bromer, Bea ; Durmacay, Jacques
Archipelago Press, 1998
Buku Referensi