Laetsch, Watson M., author
Plants : basic concept in botany
Little, Brown, 1979
 Buku Teks
De Blij, Harm J., author
Geography : regions and concept
John Wiley & Sons, 1971
 Buku Teks
Concept clarification in nursing
edited, Catherine M. Norris
An Aspen publication, 1982
 Buku Teks
Science and the concept of race
by Margaret Mead [and others]
Columbia University Press, 1968
 Buku Teks
Bartz, Albert E
Basic statistical concept
Macmillan, 1981
 Buku Teks
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