The Chicago Manual of Style (CMS) covers a variety of topics from manuscript preparation and publication to grammar, usage, and documentation and has been lovingly called the "editors’ bible." The material in this resource focuses primarily on one of the two CMS documentation styles: the Notes-Bibliography System (NB), which is used by those in literature, history, and the arts. The other documentation style, the Author-Date System, is nearly identical in content but slightly different in form and is preferred in the social/sciences.
In the NB system, you should include a note (endnote or footnote) each time you use a source, whether through a direct quote or through a paraphrase or summary. Footnotes will be added at the end of the page on which the source is referenced, and endnotes will be compiled at the end of each chapter or at the end of the entire document.
In either case, a superscript number corresponding to a note with the bibliographic information for that source should be placed in the text following the end of the sentence or clause in which the source is referenced.
The first note for each source should include all relevant information about the source: author’s full name, source title, and facts of publication. If you cite the same source again, the note need only include the surname of the author, a shortened form of the title (if more than four words), and page number(s).
If you cite the same source and page number(s) from a single source two or more times consecutively, the corresponding note should use the word "Ibid.," an abbreviated form of the Latin "ibidem," which means "in the same place." If you use the same source but a different page number, the corresponding note should use "Ibid." followed by a comma and the new page number(s).
In the NB system, the footnote or endnote itself begins with the appropriate number followed by a period and then a space. In Turabian style, the footnote or endnote begins with a superscript number.
In the NB system, the bibliography provides an alphabetical list of all sources used in a given work. This page, most often titled Bibliography, is usually placed at the end of the work preceding the index. It should include all sources cited within the work and may sometimes include other relevant sources that were not cited but provide further reading.
Although bibliographic entries for various sources may be formatted differently, all included sources (books, articles, websites, etc.) are arranged alphabetically by author’s last name. If no author or editor is listed, the title or keyword by which the reader would search for the source may be used instead.
All entries in the bibliography will include the author (or editor, compiler, translator), title, and facts of publication.
The author’s name is inverted in the bibliography, placing the last name first and separating the last name and first name with a comma; for example, John Smith becomes Smith, John. (If an author is not listed first, this applies to compilers, translators, etc.)
Titles of books and journals are italicized. Titles of articles, chapters, poems, etc. are placed in quotation marks.
The year of publication is listed after the publisher or journal name.
In a bibliography, all major elements are separated by periods.
For more information and specific examples see Chicago-Style Citation Quick Guide