Park, Joe
Macmillan, [date of publication not identified]
Buku Teks
Paul Standish
Springer, 2012
eBooks
Marasabessy, Bunyamin, author
Jurusan Pendidikan Sejarah STKIP Kie Raha, 2004
Artikel Jurnal
Wegener, Frank C.
Greeswood Press , 1957
Buku Teks
Oxford University Press, 1995
Buku Teks