Akester, Patricia, author
Sweet & Maxwell, 2008
Buku Referensi
Akester, Patricia, author
Sweet & Maxwel, [Date of publication not identified]
Buku Teks
Thorn, Eric A., author
Jay Books, 1989
Buku Referensi
Strong, William S., author
MIT Press, 1981
Buku Teks
Thorn, Eric A.
Jay Books , 1989
Buku Teks