Shaw, Ian
Sage, 2001
Buku Teks
Neuman, William Lawrence, 1950-
Allyn and Bacon, 2003
Buku Teks
Neuman, William Lawrence, 1950-
Pearson Education, 2014
Buku Teks
Neuman, William Lawrence, 1950-
Allyn and Bacon, 2000
Buku Teks
Punch, Keith F.
Sage, 1998
Buku Teks