by Agoes Arismunandar ... [and others]; editor, Gunawan Tjahjono
Archipelago, 1998
Buku Teks SO
edited by Cyril M. Harris
McGraw-Hill, 1975
Buku Referensi
Daab,
Buku Referensi
Toy, Maggie, editor
Academy Group, 1996
Buku Referensi
edited by Maggie Toy
Academy Group, 1996
Buku Teks SO