Ingrams, W.H.
HIS Majesty's Stationery Office, 1937
Buku Teks
Paul H. Elwood, Jeremy B. Albertus, editor
Nova Science Publisher, 2008
Buku Teks
Insor, D., author
Frederick A.Praeger, 1963
Buku Teks
Datta, Kalikinkar, author
Munshiram Manoharal, 1976
Buku Teks
Senelle, Robert
Ministry of Foreign Affairs and External Trade , 1979
Buku Teks