Burden, Ernest E., 1934-, author
McGraw-Hill, 1996
Buku Teks
Vandenberg, Maritz, author
Academy Editions , 1997
Buku Teks
Spens, Michael, author
Academic Edition, 1995
Buku Teks
Adams, Jonathan
Academic Edition, 1998
Buku Teks
Robertson, E. Graeme, author
Routledge & K. Paul, 1972
Buku Referensi