Roth, Audrey J., author
Wadsworth, 1995
Buku Teks
Coyle, William, author
Wadsworth and Cengage Learning, 2013
Buku Teks
Campbell, William Giles, author
Hoghton Mifflin, 1990
Buku Teks
Mahmoud, Shah, author
Betterway, 1992
Buku Referensi
Campbell, William Giles, author
Houghton Mifflin, 1967
Buku Teks