Aaron, Henry J., author
Brookings Institution, 1991
Buku Teks
editors, Diane E. Meier, Stephen L. Isaacs, and Robert G. Hughes ; foreword by Risa Lavizzo-Mourey
Jossey- Bass, 2010
Buku Teks
edited by Charlie Brooker and Julie Repper
Balliere Tindall, 1998
Buku Teks
Buku Teks
Folland, Sherman, author
Prentice-Hall, 1997
Buku Teks