Brainerd, Walter S., author
Boyd & Fraser Publishing Company, 1986
Buku Teks
Brained, Walter S., author
Boyd & Fraser publishing company, 1986
Buku Teks
Merchant, Michael J., author
Wadsworth, 1977
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Cress, Paul, author
Prentice-Hall, 1970
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Boillot, Michael, author
West Publishing Co, 1982
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