edited by E. Bradford Burns
Prentice-Hall, 1993
Buku Teks
Bemis, Samuel Flagg, 1891-1973, author
Harcourt, Brace, 1943
Buku Teks
revised by J.R.V. Marchant and Joseph F. Charles
Cassell, 1952
Buku Referensi
Follet Publishing , 1961
Buku Referensi
Marchant, James Robert Vernam, 1853-1936, editor
New York Funk & Wagnalls [t.th.]
Buku Teks