Garte, Seymour, author
Where we stand: a surprising look at the real state of our planet
American Management Association, 2008
 eBooks
Wattenberg, Ben J
The real America : a surprising examination of the State of the Union
Doubleday, 1974
 Buku Teks
Ahrens, L.H., author
Distribution of the element in our planet
McGraw-Hill, 1965
 Buku Teks
Ballard, Robert D., author
Exploring our living planet
National Geographic Society, 1983
 Buku Referensi
Margulis, Lynn, 1938-, author
Symbiotic planet: a new look at evolution
Basic Books, 1998
 Buku Teks
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