Gaya APA

Wagner, H., Wolff, P. (1977). New Natural Products and Plant Drugs With Pharmacological, Biological or Therapeutical Activity . Berlin: Springer Verlag.

Gaya MLA

Wagner, H., Wolff, P. "New Natural Products and Plant Drugs With Pharmacological, Biological or Therapeutical Activity". Berlin: Springer Verlag, 1977. Text.