edited by John M. Bennett and Robert E. Kalman
North Holland, 1981
Buku Teks
Spero, Joan Edelman, author
Wadsworth, 2010
Buku Teks
Maps Com, 2007
Buku Referensi
Erika Cudworth, Stephen Hobden and Emilian Kavalski, editors
Routledge, Taylor & Francis Group, 2018
Buku Teks
Huszar, George B. de (George Bernard), 1919-1968, author
Barnes & Noble, 1951
Buku Teks