Mueller, F. W.
McGraw-Hill Book Company, Inc., 1951
Buku Teks
Burstein, N. L.
Massachusetts Schenkman Publication , 1963
Buku Teks
Hart, Albert Gailord, 1909-, author
Prentice-Hall, 1961
Buku Teks
Friedmann, Julian, author
Intellect, 2000
Buku Teks
Hart, Albert Gailord, 1909-, author
Prentice-Hall, 1953
Buku Teks