Heinemann Educational Books, 1986
Buku Referensi
Nita Kurniati, author
Fitrama Sempana, 2007
Buku Referensi
edited by B.M. Willet
George Philip and Son, 1981
Buku Referensi
Kidron, Michael, author
Simon & Schuster, 1984
Buku Teks
C. S. Hammond and Company
C.S. Hammond & Co., [date of publication not identified]
Buku Teks