Graveline, Noel, author
Minerva, 1990
Buku Referensi
Ireland, David, author
Macmillan, 1976
Buku Teks
Aveyard, Victoria, author
Noura Books, 2016
Buku Teks
Doremus, Robert H., author
Wiley-Interscience, 1994
Buku Teks
Vandenberg, Maritz, author
Academic Edition, 1997
Buku Teks