Finding the Publication Date:
Enter the URL into the browser preceded by 'inurl:'
inurl:https://latin.packhum.org/search
After accessing that page, add '&as_qdr=y15' to the end of the URL:
https://www.google.com/search?q=inurl%3Ahttps%3A%2F%2Flatin.packhum.org%2Fsearch&rlz=1C1ASVC_pt-BRBR908BR908&oq=inurl%3Ahttps%3A%2F%2Flatin.packhum.org%2Fsearch&aqs=chrome..69i57j69i59l2j69i58.1365j0j7&sourceid=chrome&ie=UTF-8&as_qdr=y15
The date of publication will appear in the search results:

APA Format:
For entire website:
The Packard Humanities Institute. (2011, July 15). PHI Latin Texts.
Retrieved from https://latin.packhum.org/
For a particular page, the title of the page is required (in the example 'Word Search'). The publication date and URL should also pertain to the page in question:
The Packard Humanities Institute. (2011, September 28). Word Search.
PHI Latin Texts. Retrieved from https://latin.packhum.org/search?q=scapula
MLA Format:
Notice that the month is abbreviated in the publication date:
The Packard Humanities Institute. PHI Latin Texts. 15 Jul. 2011:
https://latin.packhum.org/
For a particular page:
The Packard Humanities Institute. "Word Search". PHI Latin Texts. 28
Sep. 2011: https://latin.packhum.org/search?q=scapula
Harvard Format:
The Harvard format only requires the year of publication, but, in addition to that, the date accessed is required:
The Packard Humanities Institute. (2011). PHI Latin Texts [Online].
Available at: https://latin.packhum.org/ (Accessed: 21 December 2020).
For a particular page:
The Packard Humanities Institute. (2011). Word Search [Online]. PHI
Latin Texts. Available at: https://latin.packhum.org/search?q=scapula
(Accessed: 21 December 2020).
[email protected]
give on their pages? I would assume that they have the definitive answer. Having their answer recorded here on our site would be great.