Bibliography (7):

1. 1966-gordon-figure1-longevityadvantageofgermfreemice.jpg

2. 1966-gordon.pdf#page=2

3. https://www.criver.com/products-services/find-model/swiss-webster-cfw-mouse?region=3611

4. Wikipedia Bibliography:

   1. https://en.wikipedia.org/wiki/Germ-free

      https://en.wikipedia.org/wiki/Germ-free

   2. https://en.wikipedia.org/wiki/Microbial_flora

      https://en.wikipedia.org/wiki/Microbial_flora

   3. Life table

      https://en.wikipedia.org/wiki/Life_table

   4. https://en.wikipedia.org/wiki/Cecal

      https://en.wikipedia.org/wiki/Cecal