Corbett, Edward P.J.
Scott, Foresman and Company, 1983
Koleksi Publik
Mcmahan, Elizabeth
McGraw-Hill, 1984
Buku Teks
Connelly, Mark
Wadsworth and Cengage Learning, 2013
Buku Teks
Dietsch, Betty Mattix
McGraw-Hill, 2003
Buku Teks
Dietsch, Betty Mattix
McGraw-Hill, 2003
Buku Teks