Keenleyside, Anne, author
W. Ross MacDonald School Resource Services Library, 2015
Buku Teks
Coon, Carleton S.
Alfred A. Knopf, 1955
Buku Teks
Pelto, Gretel H.
Macmillan, 1979
Buku Teks
W.J. Waworoentoe, author
1995
Artikel Jurnal
Relethford, John., author
McGraw-Hill Humanities, 2013
Buku Teks