National Academy Press, 2001
Buku Teks
Pasachoff, Jay M.
Thomson, 2001
Buku Teks
R.B. Parry, C.R. Perkins, editor
Library Association Publishing, 2001
Buku Teks
Yager, R. Yan
Hannacroic Creek Book, 1999
Buku Teks
University of California Press, 2004
Buku Teks