by Agoes Arismunandar ... [and others]; editor, Gunawan Tjahjono
Archipelago, 1998
Buku Teks SO
Daab,
Buku Referensi
edited by Maggie Toy
Academy Group, 1996
Buku Teks SO
Salvadori, Mario
Prentice-Hall, 1963
Buku Teks SO
Richards, J.M.
Newton Abbot: Davis and Charles, 1974
Buku Teks