Millspaugh, Arthur Chester, 1883-1955
The Brookings Institution, 1942
Buku Teks
Janda, Kenneth, author
Houghton Mifflin, 2000
Buku Teks
Hodgson, Godfrey
Vintage Books, 1976
Buku Teks
Millspaugh, Arthur Chester, |1883-1955
The Brookings Institution, 1942
Buku Teks
Neal, Harry Edward, author
Julian Messner, 1963
Buku Teks