(PDF)于2012-10-12). Thomas, William (编). The Literary Art of Ayn Rand. Poughkeepsie, New York: The Objectivist Center. 2005. ISBN 1-57724-070-7. McGann, Kevin. Ayn Rand
2001, Vol. 17 O'Mara, WilliamC.; Herring, Robert B.; Hunt, Lee Philip. Handbook of semiconductor silicon technology. William Andrew. 1990: 473. ISBN 978-0-8155-1237-0
S2CID 225395399, doi:10.4324/9781003035084-20, (原始内容存档于2020-11-22) (英语) McGann, James. 2020 Global Go To Think Tank Index Report. TTCSP Global Go To Think