Phythian, B.A.
London Hodder & Stoughton 1992,
Buku Teks
Alexander, L.G.
Longman , 1988
Buku Teks
Phythian, B.A.
Hodder & Stoughton, 1980
Buku Teks
Phythian, B. A.
Hodder & Stoughton, 1986
Buku Referensi
Tomasowa, Francien Herlen, author
Universitas Brawijaya , 2005
Buku Teks