Wildemuth, Barbara M.
Libraries Unlimited, 2009
Buku Teks
Johnson, Janet Buttolph, 1950-
CQ Press, 2012
Buku Teks
Dunn, Dana S.
Wiley-Blackwell, 2009
Buku Teks
Crano, William D.
Lawrence Erlbaum Assossiate, 2002
Buku Teks
Goode, William J.
McGraw-Hill, 1952
Buku Teks