Bazzanella, Liliana, editor
Springer, 2012
eBooks
editor, Roberta Cucca and Costanzo Ranci
Routledge, 2017
Buku Teks
Hira Laraya, author
2014
UI - Skripsi (Membership)
edited by Andrew Blowers, Chris Hammett and Philip Sarre
Hutchinson Educational in association with the Open University Press, 1974
Buku Teks
Gutkind, E. A.
The Free Press of Glencoe, 1963
Buku Teks