Trusted Referees

With the number of clients coming to us requiring copies of documents one would believe that we are the only people who can do so. Perhaps we are so popular because our service is free. Generally these documents can be certified by “trusted referees” and it apparently depends on organisations themselves who are considered to be "trusted referees" one site quotes the following as such:
An employee of the Police who holds the office of constable or above
Applicant's employer
Kaumatua
Lawyer
Member of Parliament
Minister of religion
NZ Honorary Consul
Notary public
Registered medical doctor
Registered teacher
Registered Chartered accountant
Justice of the Peace