When using a database like ProQuest Central, the list of results retrieved after entering search terms is actually a list of citations. A citation in a database is a description of a journal article, book, or other resource. For journal article citations, the volume and issue numbers will be present, as will page numbers. For books and other formats, you will find the date and place of publication. It is important to record all parts of a citation for future use.
The different societies that publish citation style guides do revise their standards from time to time. So online sources for these styles may be out of date. Always verify which revision or edition is being used by the online site before using their suggestions or forms.