De Vries, Mary Ann
Professional secretary's encyclopedic dictionary
Prentice-Hall, 1995
Buku Referensi
The Great family encyclopedic dictionary
Bay Books, 1986
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The encyclopedic dictionary of psychology
editor, Rom Harre, Roger Lamb
Blackwell Reference, 1983
Buku Referensi
Encyclopedic dictionary of mathematics
The MIT Press, 1987,
Buku Referensi
Encyclopedic dictionary of mathematics
The MIT Press, 1987,
Buku Referensi