Cooper, Melanie M.
McGraw-Hill, 2009
Buku Teks
Woods, A.E.
The Avi Publishing, 1977
Buku Teks
Jurch, George R.
Burgess, 1975
Buku Teks
Hamblin, W. Kenneth (William Kenneth), 1928-
Burgen Publishing, 1967
Buku Teks
Zumberge, James H.
W.M.C. Brown, 1967
Buku Teks