Walford, Nigel, author
Geographical data characteristics and sources
John Wiley & Sons, 2002
 Buku Teks
Rendall, F. J., author
Statistical sources and techniques
McGraw-Hill, 1983
 Buku Teks
Wiggins, Gary, 1943-, author
Chemical information sources
McGraw-Hill, 1991
 Buku Teks
Ikeda, Daisaku, 1928-, author
Sources of health and youth fulness
International Bureau, [date of publication not identified]
 Buku Teks
Bergson, Henri, author
The two sources of morality and religion
Doubleday Anchor Books, 1956
 Buku Teks
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