Steinhoff, Dan
McGraw-Hill, 1979
Buku Teks
Rosenblatt, S. Bernard
Houghton Mifflin, 1973
Buku Teks
Cunningham, William H.
South-Western, 1984
Buku Teks
Gates, Bill
Warner Books, 1999
Buku Teks SO
edited by Gary Hoover, Alta Campbell, Patrick Spain
The Reference Press, 1991
Buku Referensi