Ennis, Robert Hugh
Prentice-Hall, 1996
Buku Teks
Moore, Brookee Noel, author
McGraw-Hill, 2015
Buku Teks
Siti Rohmah Soekarba, author
Universitas Indonesia, 1999
UI - Tesis (Membership)
Julia Suleeman, author
Fakultas Psikologi Universitas Indonesia, 1993
UI - Laporan Penelitian
Emiliana Cindie Kusumawati, author
Fakultas Psikologi Universitas Indonesia, 2013
UI - Skripsi (Membership)