Levin, Gerald, author
Harcourt, Brace & World, 1966
Buku Teks
Corbett, Edward P.J., author
Scott, Foresman and Company, 1983
Koleksi Publik
Mcmahan, Elizabeth
McGraw-Hill, 1984
Buku Teks
Connelly, Mark, author
Wadsworth and Cengage Learning, 2013
Buku Teks
Dietsch, Betty Mattix, author
McGraw-Hill, 2003
Buku Teks