How does one build .EDU backlinks ?
Even if you believe it or not, backlinks from .EDU get additional
credibility from Google than other sites would. .EDU sites are likely
to be of high quality content therefore links from them are very nice
things to have. Coupled with the fact they tend to be of high PR,
traffic and with few outgoing links.
How to get a .EDU backlinks?

The key isn't in just asking for links or trying to exchange them. You
need to make it about them. Partner with a school, or feature a
program or students in a program related to your site's niche. Add
relevant school profiles or reviews to your site, and even build an
awards-style program over time. As you gain more credibility for
choosing quality "winners", it might mean something, and linking will
be more automatic. Interview students or professors about programs
related to your niche, and report the published interviews (reviews or
whatever) to the school's PR Director. Those are a few general tips
that you can adapt to most niches. ~ Jennifer Mattern

Here is how you get a list of .EDU site, try to use this site:edu
inurl:forums keyword , just replace the keyword with the targeted
keywords. I used forums since community sites are the easiest way to
get a backlinks. But most moderators now a days specially in .EDU
community is filtering/administering the registration before you
become an active member. Good Luck

But don't forget "good unique content" is still the king!

It's nice to see you posting here in the groups, starting
controversial topics.

In general, I would like to add that no, backlinks from .EDU domains
generally do not get "additional credibility from Google." Because of
that, the whole topic of working especially hard to talk webmasters of
these domains into linking to your sites seems a bit problematic. Why
not just create unique and compelling content and let it speak for
itself?

On that topic, I would like to remind you to take a look at the last
line that you posted: 'But don't forget "good unique content" is still
the king!' :-). It's not a good idea to copy and paste content from
other sites like http://www.blueseo.com/ituloy-angsulong-how-does-one-build-edu-backli...
. Doing so may be infringing on the copyright of others and can result
in actions being taken by the copyright owner and others. Please do
not do that again.

Thanks
John