Edited by Nadia Amoroso
Routledge, cop, 2012
Buku Teks
Holden, Robert, author
Laurence King Publishing, 1996
Buku Referensi
Hannebaun, Leroy, author
Reston Publishing, 1981
Buku Teks
Relph, Edward
Johns Hopkins University Press, 1987
Buku Teks
Waldheim, Charles, author
Princeton University Press, 2016
Buku Teks