edited by Daniel C. Mattis
World Scientific, 1994
Buku Referensi
Sternberg, Robert J.
APA, 2000
Buku Teks
Thomas Diefenbach
Ritsumeikan Asia Pacific University (APU), 2016
Artikel Jurnal
Instituto Poligrafico dello Stato, 1974
Buku Teks
Mann, Arthur
Gadjah Mada University Press, 1990
Buku Teks