Last Updated: 21 Nov, 2016 Views: 75
Yes, you can reference a web page, here is a link to the web page example in the APA guide: http://libguides.jcu.edu.au/apa/online/web
If you cannot find the date you can just write n.d. which stands for 'no date', like this:
Animals Australia. (n.d.). Think like a cat. Retrieved from http://www.electrochook/sneaky1.html
Referencing something that someone else said is called a secondary reference. Here is a link to the page on the APA guide that describes how to do this: http://libguides.jcu.edu.au/apa/what-if/read-in-another-source
Only the source that you actually saw goes in the reference list.