edited by Raymond E. Wolfinger
Prentice-Hall, 1966
Buku Teks
Masannat, George S., author
Charlies Scribuner's Sons, 1971
Buku Teks
Wilfred D. Webb
Thomas Y. Crowell Company, 1961
Buku Teks
Woll, Peter, author
Little, Brown, 1984
Buku Teks
Woll, Peter, author
Longman , 2001
Buku Teks