Borden, Iain
Architectural Press, 2003
Buku Teks SO
Eysenck, Michael W.
Psychology Press, 1995
Buku Referensi
Eysenck, Michael W.
Psychology Press, 2000
Buku Referensi
Hibbison, Eric
Prentice-Hall, 1984
Buku Referensi
Ryan, Thomas A.
Irene Rubin, 1976
Buku Teks SO