Tead, Diana
Educational, Scientific and Cultural Organization, 1952
Buku Teks SO
Macquitty, Miranda
Firefly Books, 1997
Buku Referensi
Anderson, Jessica
Viking, 1987
Buku Teks SO
Melani Budianta
Lontar Foundation, 2018
Buku Teks
O`Hagan, Andrew, 1968-
Houghton Mifflin Harcourt, 2013
Buku Teks SO