Leinwand, Gerald
Allynand Bacon, Inc., 1974
Buku Teks
Snow, Edgar, author
The World Publishing, 1944
Buku Teks
Snow, Edgar, author
Random House, 1941
Buku Teks
Art, Robert J
Pearson, 2017
Buku Teks
Brinton, Crane, 1898-1968, author
Prentice-Hall, 1960
Buku Teks