Vandenberg, Maritz, author
Academic Edition, 1997
Buku Teks
Vandenberg, Maritz, author
Academy Editions , 1997
Buku Teks
Vandenberg, Maritz, author
Academy Editions, 1996
Buku Teks
Knapp, Stephen, author
Pockport Pub, 1998
Buku Referensi
Doremus, Robert H., author
Wiley-Interscience, 1994
Buku Teks