1. 1
    Published 1981
    Book
  2. 2
    Published 1997
    ...HN 930.5 .A8 .O93...
    Book
  3. 3
    Published 2007
    ...HD 2195.5 .F996 2007...
    Archived copy available at the National Library of New Zealand
    Book
  4. 4
    Published 2018
    ...HN 930.5 .B592 2018...
    Book