Reuss, Henry S.
McGraw-Hill, 1964
Buku Teks
Boodish, H.M.
McGraw-Hill Book Company, Inc., 1949
Buku Teks
Krooss, Herman Edward, 1912-1975, author
Prentice-Hall, 1955
Buku Teks
Wright, Chester Whitney, author
McGraw-Hill, 1949
Buku Teks
Lippincott, Isaac, author
Appleton Century Croffs, 1933
Buku Teks