Unpublished Work>Publication of Limited Circulation:  Sagan , Carl (1994), Advocating science and hope : draft essay, Retrieved on 2014-03-03

Source Material [www.loc.gov]

Periodicals>Magazine Article:  Khatchadourian, Raffi (March 3, 2014), A Star in a Bottle, The New Yorker, Retrieved on 2014-02-25

Source Material [www.newyorker.com]

Periodicals>Journal Article:  Feyrer, Politi, Weil (July 2013), The Cognitive Effects of Micronutrient Deficiency: Evidence from Salt Iodization in the United States, National Bureau of Economic Research, July 2013, Retrieved on 2013-07-24

Source Material [www.nber.org]

Proceedings of Meetings and Symposia>Speech:  Kissinger, Henry (September 11, 1997), Speech by Henry Kissinger, Fourteenth Annual Ashbrook Memorial Dinner, Retrieved on 2013-07-15

Source Material [archive.is]