Whelan, Bride M.
Rockport Publisher, 1994
Buku Teks
Kopacz, Jeanne
RR Donnelley, 2003
Buku Teks
Miller, Marry C.
Wiley, 1997
Buku Teks
Engdahl, David A.
Chilton Books, 1967
Buku Teks
edited by Alex Byrne, David R. Hilbert
MIT Press, 1997
Buku Referensi