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Manlygraphic , 1989
Buku Teks
Sellers, Gene R.
WB. Saunders, 1977
Buku Teks
Anderson, Theodore R.
Holt, Rinehart, 1968
Buku Teks
Wine, R. Lowell
Prentice Hall of India, 1966
Buku Teks
Wonnacott, Thomas H., 1935-, author
John Wiley & Sons, 1990
Buku Teks