AMA Manual of Style - Stacy L. Christiansen, Cheryl Iverson 2020
References should be numbered consecutively with arabic numerals in the order in which they are cited in the text.
Unnumbered references, in the form of a resource or reading list, are rarely used in the JAMA Network journals. When they are used, these references appear alphabetically, by the first author’s last name, in a list separate from the specifically cited reference list. The difference between this type of bibliography and a reference list is that the reference list is only composed of references to those items cited in the manuscript.