Shimko, Keith L., 1962-
Cengage Learning, 2016
Buku Teks SO
Papp, Daniel S.
Macmillan, 1984
Buku Teks SO
Papp, Daniel S.
Allyn and Bacon, 1997
Buku Teks SO
Papp, Daniel S.
Macmillan, 1988
Buku Teks SO
Shimko, Keith L., 1962-
Wadsworth and Cengage Learning, 2013
Buku Teks SO