[1] Prebiotics vs. Probiotics. Accessed from: https://www.prebiotin.com/prebiotics/prebiotics-vs-probiotics/

[2] How to find the Best Probiotics Supplements. Accessed from: http://www.ehow.com/how_5146255_probiotics-supplements.html

[3] The Difference Between Probiotics & Prebiotics. Accessed from: http://www.livestrong.com/article/335114-the-difference-between-probiotic-prebiotic/

[4] “FEMS Microbiology Ecology”; Modulation of the Microbial Ecology of the Human Colon by Probiotics, Prebiotics and Synbiotics to Enhance Human Health: An Overview of Enabling Science and Potential Applications; Glenn R. Gibson, Harsharnjit S. Gill, Fransisco Guarner, Todd R. Klaenhammer, Bruno Pot, Gregor Reid, Ian R. Rowland and Mary Ellen Sanders; April 2005