Cyclopedi of world authors edited by associate editor
New York Harper and Brothers 1958
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Pears cyclopedia
editor L. Mary Barker
A & F Pears , 1949
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Tremaine, Howard M.
Audio cyclopedia
Howard W. Sams & Co., 1959
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Flynn, Peter
The world wide web handbook : a guide for users, authors and publishers
International Thomson , 1995
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Little, Charles E.
Cyclopedia of classified dates: with an exhaustive index
Gale Research Company, 1967
 Buku Referensi