I take it that I can choose multiple options here:)
Let's look at all the options:
<span><em>Use direct quotations from experts on the topic.</em> -yes! this is a good idea. Experts are reliable and quoting them will support your thesis.
<em>Link relevant portions of your paper to blog sites on the same topic.</em> -no, I don't think so: unless the blog sites are by experts, they don't have to be reliable.
<em>Discuss the topic with your classmates and include their opinions.</em> -in general, no, since your classmates are not experts on the topic. Except when they are: if, for example your research paper researches social interaction between them
.<em>Obtain more information on the topic from published sources</em> -yes, a very good idea!
<em>Include paraphrased text from authoritative sources.
</em> </span><span>-yes, a very good idea! These sources could be for example experts in the field! </span>