Fragile Earth: Dramatic views of our changing world
Collins, 2012
 Buku Referensi
Inventors and discoverers : changing our world
National Geographic Book Service
National Geographic Society, 1988
 Buku Referensi
Saaty, Thomas L., author
Embracing the future : meeting the challenge of our changing world
Praeger, 1990
 Buku Teks
Garland, John K., author
Chemistry of our world
Macmillan, 1975
 Buku Teks
Kolevzon, Edward R., author
Our world and its people
Allyn and Bacon, 1959
 Buku Teks
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