https://books.google.co.id/books?id=EHMwDAAAQBAJ&lpg=PA127&dq=Kependudukan%2C%20Ketenagakerjaan%2C%20Kesempatan%20Kerja%2C%20Pengangguran&pg=PA127#v=onepage&q=Kependudukan,%20Ketenagakerjaan,%20Kesempatan%20Kerja,%20Pengangguran&f=false