A general scheme of heads and side heads may call for the use of boldface type for first- and second-level heads and for first-level side heads in the text, although heading styles and formats vary among journals (see also , Manuscript Preparation, Parts of a Manuscript, Headings, Subheadings, and Side Headings). For example: METHODS (level 1 head, flush left, bold caps) Statistical Analysis (level 2 head, bold caps and lowercase) Clustering Data. (level 3 head or first-level side head, paragraph indent, run into the text, bold caps and lowercase).Boldface may also be used in text to call out references to ...
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