Babcock, Chester D.
Scott, Foresman, 1956
Buku Teks SO
by William A. Barnett ... [and others]
Cambridge University Press, 1995
Buku Teks SO
Reamer, Frederic G.
Columbia University Press, 1999
Buku Teks
Algie, Jimmy
kogan page, 1975
Buku Teks
Harcourt, Brace & World, 1970
Buku Teks