Stewart, Rosemary, author
Macmillan, 1993
Buku Teks
Formisano, Roger A., author
McGraw-Hill, 2004
Buku Teks
Brinkerhoff, Robert O., author
Sage, 1990
Buku Teks
Formisano, Roger A., author
McGraw-Hill, 2004
Buku Teks
Huber, Diane L., author
Elsevier Saunders, 2005
Buku Teks