by Agoes Ariesmunandar, Julian Davison, Bea Bromer and Jacques Durmacay
Archipelago Press, 1998
Buku Referensi
Daab,
Buku Referensi
Toy, Maggie, editor
Academy Group, 1996
Buku Referensi
edited by Maggie Toy
Academy Group, 1996
Buku Teks SO
Salvadori, Mario
Prentice-Hall, 1963
Buku Teks SO