Keeler, Hali R., 1952-, author
Rowman & Littlefield, 2016
Buku Teks
Artikel Jurnal
Rubin, Richard E., author
Neal-Schuman Publishers, Inc. , 1998
Buku Teks
The University of Chicago Press , 1965
Buku Teks
Rubin, Richard, 1949-, author
Neal-Schuman, 2016
Buku Teks