Wikipedia. Web. 03 Nov. 2011. <http://www.wikipedia.org/>. "A Timeline on Atomic Structure." BarcodesInc - Barcode Printer, Barcode Scanner, Point of Sale, Mobile Computing and RFID Experts. BarcodesInc, 1994. Web. 03 Nov. 2011. <http://www.barcodesinc.com/articles/timeline-on-atomic-structure.htm>. BookRags.com | Study Guides, Lesson Plans, Book Summaries and More. BookRags, Inc., 2011. Web. 03 Nov. 2011. <http://www.bookrags.com/>.
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