Timmers, J.J.M.
De glorie van Nederland
Tirion, 1990
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
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Weideman, Hugh
The rapid fact finder : a desk book of universal knowledge / compiled by Hugh Weideman
Thomas Y. Crowell Company, 1958
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Merriam-Webster's collegiate encyclopedia
Merriam-Webster, 2000
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