Gaya APA
Vaessen, Martin. (1980).
Problems of organizing an international survey/ Martin Vaessen .
London:
Membley Center.
Gaya Chicago
Vaessen, Martin.
Problems of organizing an international survey/ Martin Vaessen.
London:
Membley Center,
1980.
.
Gaya MLA
Vaessen, Martin.
Problems of organizing an international survey/ Martin Vaessen.
London:
Membley Center,
1980.
.
Gaya Turabian
Vaessen, Martin.
Problems of organizing an international survey/ Martin Vaessen.
London:
Membley Center,
1980.
.