Hayes, Carlton J. H.
Macmillan,
Buku Teks
Hughes, H. Stuart
Frentice Hall,, 1961
Buku Teks
Palmer, R.R. (Robert Roswell), 1909-2002, author
Alfred A. Knopf, 1983
Buku Teks
Palmer, R.R. (Robert Roswell), 1909-2002, author
Alfred A. Knopf, 1971
Buku Teks
Palmer, R.R. (Robert Roswell), 1909-2002, author
McGraw-Hill, 1950
Buku Teks