[publisher not identified], [date of publication not identified]
Buku Teks
Srivastava, Mahavir Prasad, 1941-
Prentice Hall of India Private , 1982
Buku Teks
Peffer, Nathaniel
University of Michigan Press, 1958
Buku Teks
Feavearyear, Albert
Oxford Clarendon Press , 1963
Buku Teks
Clyde, Paul Hibbert
Prentice-Hall, 1960
Buku Teks