Olmstead, A.T., author
University of Chicago Press, 1948
Buku Teks
Torga, Miguel, author
Rua Cintura do Porto, 2003
Buku Referensi
Vasiliev, A. A.
University of Wisconsin Press, 1952
Buku Teks
Mitchell, Stephen, 1948-, author
Wiley Blackwell, 2015
Buku Teks
Harp, Stephen L., author
Wiley Blackell, 2016
Buku Teks