Smith, Jonathan D.H., author
CRC Press, Taylor & Francis Group, 2009
Buku Teks
Whitelaw, Thomas A., author
Blackie Academic & Professional, 1995
Buku Teks
Barnes, Wilfred E., author
D. C. Hearth, 1963
Buku Teks
Ehrlich, Gertrude, author
PWS-Kentt Publishing, 1991
Buku Teks
Olmsted, John M. H.
Appleton-Century-Crofts, 1968
Buku Teks