Nevins, Allan, 1890-1971
Macmillan, 1927
Buku Teks
Niel, Robert Van
Foris Publications, 1960
Buku Teks
Lewis, Bernard
Oxford University Press, 1961
Buku Teks
Nevins, Allan, 1890-1971
Macmillan, 1957
Buku Teks
Fellner, William, 1905-
McGraw-Hill, 1960
Buku Teks