Douglas, Dan, author
Cambridge University Press, 2000
Buku Teks
Bloomfield, Leonard, author
Holt, Rinehart and Winston, 1961
Buku Teks
Revesz, G
Longmans, 1956
Buku Teks
[publisher not identified], [date of publication not identified]
Buku Referensi
Muhadjir, author
Badan Penyelenggara Seri NUSA, Universitas Atma Jaya , 1981
Buku Teks