Healey, Joseph F., 1945-, author
Pine Forge Press, 1998
Buku Teks
Penguin Education, 1973
Buku Teks
Ore, Tracy E., author
Mayfield Publishing, 2000
Buku Teks
Baldridge, J. Victor, author
John Wiley & Sons, 1980
Buku Teks
edited by Cheryl R. Lehman
Emerald, 2017
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