Singh, Surendra, author
Vikas, 1979
Buku Teks
Van Vlack, Lawrence H., author
Addison-Wesley, 1982
Buku Teks
Timings, Roger Leslie, 1927-, author
Longman Scientific, 1989
Buku Teks
John, Vernon, author
Macmillan, [Date of publication not identified]
Buku Teks
Timings, Roger Leslie, 1927-, author
Longman, 1991
Buku Teks