Olivia Rizky Kallista, author
Cambridge University Press, 1995
Buku Teks
Menocal, Maria Rosa, author
Noura Books, 2016
Buku Teks
Torga, Miguel, author
Gavea, 2004
Buku Teks
Preeg, Ernest H.
The Brookings Institution, 1970
Buku Teks
Sanger, Richard H., author
Cornell University Press, 1954
Buku Teks