If the author's name is not mentioned in the text. If the author's name is not used in the sentence introducing the source material, then include the author's last name in the parenthetical citation before the page number(s).
And then it went away when I started it again. It was better then a drug â¦ and no side affects! (Later, I found out that the sourse cause of the heartburn was a simple vitamine C tablet that I had also been taking.) Just one more thing. John Lee, M.D. also said that magnesium deficiency can cause leg cramps.
1 Consuming too much caffeine and other stimulants can cause muscles in any part of the body to twitch.  Deficiencies of certain nutrients can cause muscle spasms, particularly in the eyelids, calves, and hands. Common types of nutritional deficiencies include vitamin D, vitamin B, and calcium deficiencies.