Westview Press, 1990
Buku Teks
Tromly, Benjamin, 1976-, author
Cambridge University Press, 2014
Buku Teks
Spector, Ivar
Van Nostrand Reinhold, 1949
Buku Teks
Bayanov, B., author
Progress , [1968]
Buku Teks
Bauer, Raymond A., author
Harvard University Press, 1952; 1959
Buku Teks