Smith, Gary
Allyn and Bacon, 1985
Buku Teks
Bennett, Jeffrey O.
Pearson - Addison Wesley, 2009
Multimedia
Bennett, Jeffrey O.
Pearson - Addison Wesley, 2009
Buku Teks
Shavelson, Richard J.
Allyn and Bacon , 1988
Buku Teks
Levi, Edward H.
London: The University of Chicago Press, 1949,
Buku Referensi