Timmins, Geoff, author
Sage, 2006
Buku Teks
by George E. Miller ... [et al.]
Harvard University Press, 1968
Buku Teks
Routledge, 2004
Buku Teks
James A. Coleman; John Klapper
Routledge, 2005
Buku Teks
Fries, Charles Carpenter, author
University of Michigan Press, 1951
Buku Teks