Michael, Franz, author
Henry Holt and Co., 1956
Buku Teks
Peffer, Nathaniel, author
University of Michigan Press, 1958
Buku Teks
Vinacke, Harold M., author
Appleton-Century-Crofts, 1950
Buku Teks
Vinache, Harold M., author
George Allen and Unwin, 1950
Buku Teks
Vinacke, Harold M., author
George Allen and Unwin, 1950
Buku Teks