Pylee, M.V., author
Asia Publishing House, 1960
Buku Teks
Prentice Hall of India, 1985
Buku Teks
Minaturr, Joseph, author
Martinus Nijhoff, 1961
Buku Teks
New Delhi Planning Commision s.n.,
Buku Teks
Hardgrave, Robert L., author
Harcourt, Brace, 1970
Buku Teks