New York Funk and Wagnalls 1958
Buku Referensi
Funk & Wagnalls Co., 1958
Buku Referensi
editor, Maria Leach
Funk & Wagnalls Co., 1949
Buku Referensi
editor, Maria Leach
Funk & Wagnalls Co., 1949
Buku Referensi
Enciclopedia Britanica, 1961
Buku Referensi