Mitroff, Ian I.
Elsevier, 1974
Buku Teks
Benton, Ted, author
Design , 2001
Buku Teks
Ziman, John, author
Cambridge University Press, 1994
Buku Teks
Maslow, Abraham H., author
Harper & Row, 1966
Buku Teks
edited by Ron Sun
Cambridge University Press, 2008
Buku Referensi