Almanak jagad raya
editor, Widjiono Wasis
Dian Rakyat, 1991
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The encyclopedia American
Americana Corporation, 1980
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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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