ENFOQUE

• Outline of Plant Classification,.
  HOLMES, S.
  Longman Inc. New York
  1983
• (eds) Art, Anthropology and Aesthetics
  COOTE, J. And SHELTON, A.
  Oxford : Oxford University Press.
  -1992
• Biochemistry, 3rd ed. (National medical series for independent study)
  DAVIDSON, Victor L. / SITTMAN, D.B.
  Philadelphia: Harwal
  1994
• Practical Physics, 3rd edition
  SQUIRES G.L.
  Cambridge University Press
  1985