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Nybakken, James W. (James Willard), author
Benjamin Cummings, 2001
Buku Teks
Nybakken, James W. (James Willard), author
Harper Collins, 1993
Buku Teks
Meadows, P.S., author
John Wiley & Sons, 1988
Buku Teks
Sumich, James L., author
Wm.C. Brpwn, 1992
Buku Teks