Blum, Mark
Bugs in 3-D
Chronicle Books, 1998
 Buku Referensi
Shaffer, Rick
Your guide to the sky
Lowell House, 1999
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Katz, William A., 1924-
Your library : a reference guide
Holt, Rinehart and Winston, 1979
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Graves, Robert
The reader over your shoulder: a handbook for writers of English prose
Macmillan, 1943
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Rainey, Dennis
Building your marriage : leader's guide
Arkansas: The Lockman Foundation; 1989,
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