Campbell, William Giles, author
Houghton Mifflin, 1967
Buku Teks
Watson, George, author
Longman, 1987
Buku Teks
Brown, Leland, author
Prentice-Hall, 1959
Buku Teks
May, Claire B., author
Upper saddle river, 2009
Buku Teks
Meyers, Alan, 1945-, author
Pearson Education, 2014
Buku Teks