serial publication periodical http://id.loc.gov/authorities/subjects/sh85099890 http://purl.bioontology.org/ontology/MESH/D020492 http://semanticscience.org/resource/SIO_000162 https://en.wikipedia.org/wiki/Category:Periodicals https://en.wikipedia.org/wiki/Periodical_literature https://www.wikidata.org/wiki/Q1002697 AP A periodical is a publication that appears on a regular schedule. PN4700-PN5650 periodical literature periodical publication periodicals collection of documents