A manual for writers of research papers, theses, and dissertations, 7th edition - Kate L. Turabian 2007
Indentation
Parenthetical citations–reference list style: the basic form
Part II. Source Citation
Reference list entries have a hanging indentation: the first line is flush left and all following lines are indented the same space as paragraphs. Parenthetical citations are placed within the text and are not indented.