Barry J. Zimmerman, Dale H. Schunk, editor
Routledge, 2011
Buku Teks
edited by Mark Easterby-Smith, Marjorie A. Lyles
John Wiley & Sons, 2011
Buku Teks
Doubleday, 1994
Buku Teks
Grant, Patricia
Prentice-Hall, 1989
Buku Referensi
edited by Kjell Erik Rudestam and Judith Schoenholtz-Read
Sage, 2002
Buku Referensi