Boston, Jonathan, author
Emerald, 2017
eBooks
Peters, B. Guy, author
Sage , 2013
Buku Teks
Banta, William F., author
Lexington Books, 1989
Buku Teks
Issel, L. Michele, author
Jones & Bartlett Learning, 2014
Buku Teks
Huszar, George B. de (George Bernard), 1919-1968, author
Littlefield, Adams, 1959
Buku Teks