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