Penfield, Elizabeth
Scott, Foresman and Company, 1985
Koleksi Publik
Mcmahan, Elizabeth
McGraw-Hill, 1984
Buku Teks
Connelly, Mark
Wadsworth and Cengage Learning, 2013
Buku Teks
Sloane, Thomas O.
Oxford University Press, 2001
Buku Referensi
Vancil, David L.
Allyn and Bacon, 1993
Buku Teks