Brace, Nicola
Palgrave Macmillan, 2018
Buku Teks
Kristine Krapp, Editor
Thomson Gale, 2004
Buku Referensi
editors, Gerald P. Koocher, John C. Norcross, Sam S. Hill, III
Oxford University Press, 2005
Buku Teks
editor, Gerald P. Koocher, John C. Norcross, Sam S. Hill
Oxford University Press, 2005
Buku Referensi
Axelrod, Michael I.
Routledge, 2017
Buku Teks