Ohio North Light Books, 1992
Buku Teks SO
arranged and edited by Wolfgang Hageney
Belvedere, 1989
Buku Teks
Harper, Laurel
Chronicle Books, 1999
Buku Referensi
Geary, David M.
Prentice-Hall, 1997
Buku Teks
White, Edward T.
Florida University, [19?-]
Buku Teks