Wade, Terence
New York : Oxford University Press, 2002
Buku Referensi
edited by Colin Howlett
Oxford University Press, 1996
Buku Referensi
edited by P. S. Falla
Clarendon Press, 1990
Buku Referensi
Harkins, William E., author
Littlefield, Adams, 1959
Buku Referensi
Smirnitsky, A.I., author
Higher School Publishing House, 1975
Buku Teks