Barden, John A.
Plant science
McGraw-Hill, 1987
Buku Teks
Analytical techniques for atmospheric measurement
edited by Dwayne E. Heard
Blackwell , 2007
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Ouellette, Robert P.
Computer techniques in environmental science
Petrocelli/Charter, 1975
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Blalock, Hubert M.
Conceptualization and measurement in the social science
Sage Publications, 1982
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Payne, James L.
Principles of social science measurement
Lytton, 1975
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