Sukharanjan, Dasgupta
Vikas , 1978
Buku Teks
Rutherford, Mervyn
Currency Press, 1979
Buku Teks
Stewart, Douglas, author
Angus and Roberson Publishers, 1962
Buku Teks
Dunham, Clarence W.
McGraw-Hill, 1962
Buku Teks
Walton, Evangeline
Arkham House, 1945
Buku Teks