My Sources:

Webdm.com
nlm.nih.gov
http://goddesshobbies.blogspot.com/2013_03_01_archive.html
http://healthyeating.sfgate.com/caloric-needs-athletes-7179.html
http://www.bodybuilding.com/fun/mma_nutrition_guide.htm
http://www.lose-weight-fast-free.com/calories-to-lose-weight.
https://play.google.com/store/apps/details?id=com.myfitnesspal.android
http://www.mass.gov/eohhs/gov/departments/dph/programs/community-health/mass-in-motion/healthy-living/portions/calories-count.html