Referencing Guide: Chicago Manual of Style Author-Date

Label the list of sources “References” and arrange entries in alphabetical order according to the first word of the author's name or the title if author(s)/editor(s) is not identified. Use a period to define major sections of the reference.

1. Author's name is inverted, surname first, and then first name(s. Use “and,” not an ampersand, “&,” for multi-author entries. List names of all authors in the order they appear in the original source and up to ten names. If there are more than ten names, use et al. after the first name.
2. Date of publication. Use the abbreviation n.d. if no publication date is available.
3. Title of article, patent, conference paper, etc., in quotation marks and set in title case.
4. Title of journal or book in italics and set in title case.
5. Publisher name in full.
6. Access date provided if publication date is unavailable
7. Prefer DOI instead of URLs whenever possible.

An in-text citation should contain two pieces of information with no intervening punctuation

• The the last name of the author(s) used in the corresponding reference list entry
• The year the work was published, for example: (Smith 2016)
• If there is more than one author, include the last names of authors using commas, for example: (Smith, Lee, and Alvarez 2016)
• If  there is four or more authors, include the last name of the first author and use et al for the rest, for example: (Smith et al. 2016)
• If using multiple works in the same year for the same author, alphabetize the titles in the reference list and add a, b, c, etc. to the year, for example (Lee 2015a); (Lee 2015b)
• When a source has no identifiable author, cite it by its title using a shortened form (up to four keywords from that title) 
• To cite specific page(s), add a comma and the page number(s), for example: (Smith 2016, 21-23)
• If the author's name appears in the sentence, do not include the name again in the parentheses: Smith (2016) indicates that good citation practices are important.