Funk & Wagnalls, 1980
Buku Referensi
edited by George Watson
Cambridge University Press, 1971
Buku Referensi
edited by I.R. Willison
Cambridge University Press, 1972
Buku Referensi
editor, Maria Leach
Funk & Wagnalls Co., 1949
Buku Referensi
New York Funk and Wagnalls 1958
Buku Referensi