AMA Style uses a superscript-style of citation. References are listed at the end of the paper in numerical order as they appear in the body of your paper. Each source has its own superscript number. Single-space the reference list.
Journal titles in references should appear abbreviated and italicized. As shown in the examples, use upper-and-lower case letters. The NLM Catalog can help you locate journal title abbreviations.
Book titles in references consist of italics and upper-and-lower case letters. Words of 3 or fewer letters (e.g., and, the, is are typically lowercased.