Sure, you can. You can paste links like you did, it´s not advisable to copy-paste chunks from other sites, you know, because it´s regarded as plagiarism. In case someone needs to cite something else (little chunks or sentences) it´s he better to italicize it and put the link/url/source.
As for Google, it´s an amazing tool. You have just proved it.
I have some qualms about its use, and some of its policies. For instance, I used a little search
engine that collected hits from several other search engines (eight, if memory serves me well, Google included). So, it had a "search within" feature, you would find something in a jiffy.
Now, running a search on Google seems like watching paint dry, believe me, so slooooooow! and not surprising (maybe) afterwards, Google itself killed the "searching within" feature.
Now, lots of advertisement comes first...
Not that I have anything to complaint about, I am just expressing my opinion, from an user p.o.v. (and I use Google a lot, but can´t say it´s as good to linguists, students etc, as it was.).
Summing up, it´s now way harder to separate the wheat from the chaff, when it comes to (more relevant) searching.