Wallace, Catherine
1992
Buku Teks
Wallace, Catherine
Oxford University Press, 1993
Buku Teks SO
by Jay Lehr [and others]
McGraw-Hill, 2002
Buku Referensi
by Jay Lehr, Marve Hyman, Tyler E. Gass, William Seevers
McGraw-Hill, 2001
Buku Referensi
Bedient, Philip B.
Prentice-Hall, 1994
Buku Teks SO