Tracy, Brian, author
Berrett-Koehler, 2012
Buku Teks
Artikel Jurnal
Riggio, Ronald E., author
Pearson, 2009
Buku Teks
William D. Crano, Radmila Prislin, editor
Psychology Press, 2008
Buku Teks
Fakultas Psikologi Universitas Indonesia,
Majalah, Jurnal, Buletin