"The central function of a legal citation is to allow the reader to efficiently locate the cited source." The Bluebook: A Uniform System of Citation 1 (Columbia Law Review Ass'n et al. eds., 20th ed. 2015).
Citations in legal writing serve two purposes:
Avoid accidental plagiarism by citing a source for any idea that is not original.
The Bluepages section of the Bluebook addresses non-academic citation. It is citation for practitioners and law clerks. Here you will find guidance and examples of citation formats that you will use when writing your memoranda, briefs, and other court documents.
Turn to page IX of the Bluebook to see the Table of Contents listing the topics covered in the Bluepages, including:
Page 4 has a helpful table that sets out the differences between the typeface used in non-academic and academic citation.
The white pages in the Bluebook address academic citation. It is citation for law reviews, journals, and other academic legal publications. The white pages expand on the rules included in the Bluepages. N.B. The citations in the white pages use large and small capital letters. If you consult the examples here remember that large and small caps are never used in non-academic citation.