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D.C. Health, 1986
Buku Teks
Dunfee, Thomnas W., author
Prentice-Hall, 1983
Buku Teks
Phelan, Nancy
Oxford University Press, 1987
Buku Teks
Barnes, A. James, author
Homewood, Ill., Learning Systems
Buku Teks
Carvan, John
LBC Information Service, 1997
Buku Teks