A number or expression that is set higher than the baseline and slightly smaller, to act as a superior or superscript
(#PCDATA | bold | italic | monospace | overline | roman | sans-serif | sc | strike | underline | sub | sup)*
Any combination of:
<anonymous>, <article-title>, <bold>, <chapter-title>, <collab>, <comment>, <edition>, <given-names>, <issue>, <issue-part>, <italic>, <mixed-citation>, <monospace>, <overline>, <p>, <part-title>, <prefix>, <publisher-loc>, <publisher-name>, <role>, <roman>, <sans-serif>, <sc>, <series>, <source>, <strike>, <string-name>, <sub>, <suffix>, <sup>, <supplement>, <surname>, <title>, <trans-source>, <trans-title>, <underline>, <volume>
APA-references-delivery-1.2.dtd