London : Consumers association and hodder & stoughton, 1989, 1989
Buku Referensi
Yeremia Hardiawan Karaprianto, author
Fakultas Hukum Universitas Indonesia, 2016
UI - Skripsi Membership
Leder, Malcolm, author
Longman Group, 1991
Buku Teks
Mickelburgh, John
Profesional Books, 1979
Buku Teks
Borrie, Gordon, author
Penguin Books, 1976
Buku Teks