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John Wiley & Sons, 1990
Buku Referensi
Bray, Richard Nicholas
Arnold, 1997
Buku Referensi
editors, Jonathan T. Ricketts, M. Kent Loftin, Frederick S. Merritt
McGraw-Hill, 2003
Buku Referensi
editor, Frederick Merritt
McGraw-Hill, 1983
Buku Referensi
edited by Robert H. Perry, Don W. Green and James O. Maloney
McGraw-Hill, 1997
Buku Referensi