Pamela Paul, edited
New York Henry Holt and Company, 2014
Buku Teks SO
edited by Francis Brown
A Mentor Book, 1954
Buku Teks SO
Durdin, Tillman
Atheneum, 1966
Buku Teks SO
Macmillan Digital USA, 1995
Multimedia
edited by John W. Wrigth
Penguin Group, 2003
Buku Referensi