The APA Guide (6th ed.)

Reference list (basic rules)

Here are some basic rules to keep in mind when compiling a reference list.

  1. The reference list begins on a new page at the end of a paper (or assignment).
  2. The reference page includes only those sources which were cited in the work (unlike a bibliography).
  3. The word References is centered at the top of the page.
  4. Just like other pages, the reference list is double-spaced.
  5. All reference entries are arranged in alphabetical order by authors' last names.
  6. The references are not numbered.
  7. The hanging indent is used for each entry: all the lines following the first line of the entry are indented ½ inch (1,27 cm) from the left margin.
  8. For multiple works by the same author(s) published in the same year, the entries are listed in chronological order (from the earliest to most recent), and lower case Latin letters (e.g., a, b) are placed in parentheses after the publication year in each entry.

Example:

References

Abedi, J., Courtney, M., Mirocha, L., Leon, S., & Goldberg, J. (2001a). Language accommodation for large-scale assessment in science. Los Angeles, CA: University of California, National Center for Research on Evaluation, Standards, and Student Testing.

Abedi, J., Hofstetter, C., Baker, E., & Lord, C. (2001b). NAEP math performance and test accommodations: Interactions with student   language background (CSE Tech. Rep. No. 536). Los Angeles, CA: University of California, Center for the Study of Evaluation/ National Center for Research on Evaluation, Standards, and Student Testing.

Agresti, A. (2002). Categorical data analysis (2nd  ed). New York: Wiley-Interscience.

Bernardini, S. (2004). Corpora in the classroom: An overview and some reflections on future developments. In J. McH. Sinclair (Ed.), How to use corpora in language teaching (pp. 15–36). Amsterdam/ Philadelphia: John Benjamins.

Boulton, A. (2010). Data-driven learning: Taking the computer out of the equation. Language Learning, 60(3), 534–572.

Cotos, E. (2014). Enhancing writing pedagogy with learner corpus data. ReCALL, 26(2), 202–224.