APA Style
      Blackman, R.L., Astop, V.F. E. (1994).
    APHIDS ON THE WORLD'S TREES : AN IDENTIFICATION AND INFORMATION GUIDE .
    Cambridge:
  CAB International.
  
Chicago Style
      Blackman, R.L., Astop, V.F. E.
    APHIDS ON THE WORLD'S TREES : AN IDENTIFICATION AND INFORMATION GUIDE.
    
    Cambridge:
  CAB International,
  1994.
  Text.
  
MLA Style
      Blackman, R.L., Astop, V.F. E.
    APHIDS ON THE WORLD'S TREES : AN IDENTIFICATION AND INFORMATION GUIDE.
    
    Cambridge:
  CAB International,
  1994.
  Text.
  
Turabian Style
      Blackman, R.L., Astop, V.F. E.
    APHIDS ON THE WORLD'S TREES : AN IDENTIFICATION AND INFORMATION GUIDE.
     
    Cambridge:
  CAB International,
  1994.
  Print.