Furnas, C. C., author
Time Incorporated, 1966
Buku Referensi
edited by Edward H. Smith
Butterworth-Heinemann, 1995
Buku Teks
Carvill, J., author
Butterworth-Heinemann Ltd., 1993
Buku Referensi
Parmley, Robert O., author
McGraw-Hill, 1981
Buku Referensi
Kelley, David S.
McGraw-Hill, 2001
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