edited by A.J. Walford
Library Association, 1981
Buku Referensi
editor, David L. Sills
Macmillan Co. & The Free Press, 1968
Buku Referensi
edited by I. Grattan-Guinness
Routledge, 1994
Buku Referensi
Facet Publishing, 2005
Buku Referensi
Baert, Patrick, author
Polity Press, 2005
Buku Teks