The instructions on this page concern references to entries in encyclopedias and dictionaries. Some encyclopedias/dictionaries will have a group author, e.g. organization or company, instead of a personal author. If the publisher is the same as the group author, omit the publisher from the source element. If the encyclopedia/dictionary does not have an editor, leave out this part and simply state "In" followed by the title of the encyclopedia/dictionary. For entries in online encyclopedia or dictionary, include the month and day in the publication date if available. If the online reference work is continously uppdated and the versions are not archived, state "n.d." as the year of publication and conclude the reference with information on the retrieval date in addition to the URL.
If a DOI has been assigned to the encyclopedia/dictionary, include this number in the reference. If no DOI has been assigned and the encyclopedia/dictionary was accessed online from a nondatabase website, use the URL of the webpage from which it was retrieved. If the encyclopedia/dictionary was accessed in print or retrieved from an academic database, no URL is included.
Do not forget to consult the general instructions on how to write references according to APA (7th edition), including how to write in-text references and construct a reference list, the number of authors to be included, how to write references to two or more works within the same parenthesis, what to do if you have several references with the same author and publication date, how you cite specific parts of works, how to handle incomplete reference information (e.g. missing author information or no publication date), and when/how to use acronyms.
Author, A. A., Author, B. B., & Author, C. C. (YYYY). Title of entry. In C. C. Editor & D. D. Editor (Eds.), Title of encyclopedia/dictionary (#th ed., Vol. #, pp. page number-page number). Publisher. DOI or URL
Author, A. A., Author, B. B., & Author, C. C. (YYYY, Month DD). Title of entry. In C. C. Editor & D. D. Editor (Eds.), Title of encyclopedia/dictionary. Publisher. URL
Name of Group. (n.d.). Title of entry. In Title of encyclopedia/dictionary. Publisher. Retrieved Month DD, YYYY, from URL
(Dahlgren et al., 2008)
(Rogers et al., 2019)
Dahlgren, R.A., Macías, F., Arbestain, M.C., & Chesworth, W. (2008). Acid soils. In W. Chesworth (Ed.), Encyclopedia of soil science. Springer. https://doi.org/10.1007/978-1-4020-3995-9_7
Nationalencyklopedin. (n.d.). Akvakultur [Aquaculture]. In NE.se. Retrieved October 8, 2020, from https://www.ne.se/uppslagsverk/ordbok/svensk/akvakultur
Rogers, K., Green, E. R., & Joshi, S. H. (2019, November 25). Biology. In Encyclopædia britannica. Retrieved December 12, 2019, from https://www.britannica.com/science/biology