Root, Franklin R., author
Lexington Books, 1987
Buku Teks
Majaro, Simon, author
George Allen & Uniwin, 1982
Buku Teks
Stephen Young [and others]
Prentice-Hall, [date of publication not identified]
Buku Teks
Cundiff, Edward W., author
Prentice-Hall, 1988
Buku Teks
Cateora, Philip R.
2005
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