edited by Robert E. Beck
Academic Press, 1977
Buku Teks
Szasz, F.A., author
John Wiley & Sons, 1981
Buku Teks
Tolkien, J.R.R. (John Ronald Reuel), 1892-1973, author
Houghton Miffiln, 1987
Buku Teks
Anick, David, author
AK Peters 1993, 1993
Buku Teks
Passman, Donald S., author
John Wiley & Sons, 1979
Buku Teks