References for information in a table should be numbered and listed according to how it was listed in the text. In other words, if the source from which the material referred to in the table is one of the references used in the text, that same reference number should also be used in the table. See example below for Arabic superscript numeral, 28.
Keep in mind, it is acceptable for a reference to be cited only in a table and not in the text. If the reference pertains only to the table or figure (ie, the source is not cited elsewhere in the text), the reference should be listed and numbered according to the first mention of the table or figure in the text. All references in an article should appear in the reference list regardless if it only appears in the table.
Use Footnotes for citing references.
Use footnotes that contain lower case Arabic letters for citing your references along with Arabic superscript numerals outside periods and commas, inside colons and semicolons. See example below with Footnote a and superscript number 28.
When using footnotes as in the example above (a) to reference your sources, use terminology such as:
When both a footnote letter and reference number follow data within a table, set the reference number first, followed by a comma and the footnote letter. See example:
For more detailed information about figure components, see section 4.2.6 in the AMA Manual.
The figure title follows the designation “Figure” numbered consecutively (ie, Figure 1, Figure 2). Articles that contain a single figure (as in the one below) use the designator “Figure” (not “Figure 1”).
The figure legend (caption) is written in sentence format and printed below or next to the figure. It will also contain citations if you did reproduce any data from another source.
Citing your sources. It is preferable to use original figures rather than those already published.
However when use of a previously published illustration, photograph, or other figure is necessary, written permission to reproduce it must be obtained from the copyright holder (usually the publisher). The original source should be cited in the legend (see example below) with the citation number for the reference corresponding to its first appearance in the text, tables, or figures.
These examples of legends that serves as citations, should be placed below the descriptive legend.
Reprinted with permission from the American Academy of Pediatrics.5
Terminology: As in proper citation for tables, use terminology that applies to whether you modified or performed a calculation:
Adapted from. . .
Data were derived from. . .