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