Abbreviations - Parenthetical citations–reference list style: the basic form - Part II. Source Citation

A manual for writers of research papers, theses, and dissertations, 7th edition - Kate L. Turabian 2007

Abbreviations
Parenthetical citations–reference list style: the basic form
Part II. Source Citation

Abbreviate terms such as editor, translator, and volume (ed., trans., and vol.). The plural is usually formed by adding s (eds.) unless the abbreviation ends in an s (use trans. for both singular and plural). Your local guidelines may allow you to use additional abbreviations such as Univ. for University.