Fraser, Marshall, author
Burgess Publishing Company, 1979
Buku Teks
Pearson Education , 2009
Multimedia
McKeague, Charles P., 1946-, author
Brooks/Cole Cengage Learning, 2012
Buku Teks
Hutchison, Donald, author
McGraw-Hill, 2000
Buku Teks
Hutchison, Donald, author
McGraw-Hill, 2000
Multimedia