20th-century world architecture / Phaidon Press
Phaidon press, 2012
 Buku Referensi
Encyclopedia of psychology; Vol. 4
edited by Raymond J. Corsini
John Wiley & Sons, 1994
 Buku Referensi
The encyclopedia of religion; Vol. I
edited by Mircea Eliade
Macmillan, 1987
 Buku Referensi
Encyclopedia of mathematics Vol. 3
Kluwer Academic Publishers, 1995,
 Buku Referensi
Encyclopedia of mathematics Vol. 4
Kluwer Academic Publishers, 1995,
 Buku Referensi