Cohen, Einya, author
Mouton, 1977
Buku Referensi
Cambridge University Press, 2006
eBooks
Koester, Almut, author
Routledge, 2006
Buku Teks
Dorothy V.M. Bishop, Laurence B. Leonard
Psychology Press , 2001
Buku Teks
edited by James F. Kavanagh and James E. Cutting
MIT Press , 1975
Buku Teks