Periodicals>Journal Article:  Allee, Warder Clyde (1943), Where Angels Fear to Tread: A contribution from general sociology to human ethics, Science, vol 97, 1943, p.521, Retrieved on 2011-09-03

Electronic/World Wide Web>Internet Article:  Pennisi , Elizabeth (23 August 2011), Does Religion Influence Epidemics?, AAAS Science, Retrieved on 2011-08-28

Source Material [news.sciencemag.org]