Weerth, Georg, author
Samtliche werke in funf banden
Aufbau, 1956
 Buku Teks
The encyclopedia American
Americana Corporation, 1980
 Buku Referensi
Stimpson, George
Book about a thousand things / by George Stimpson
Harper and Brothers Publisher, 1946
 Buku Referensi
Weideman, Hugh
The rapid fact finder : a desk book of universal knowledge / compiled by Hugh Weideman
Thomas Y. Crowell Company, 1958
 Buku Referensi
Merriam-Webster's collegiate encyclopedia
Merriam-Webster, 2000
 Buku Referensi
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