Question

Which journal papers are reffered and non reffered?

Answer 1

Peer-reviewed (refereed or scholarly) journals - Articles are written by experts and are reviewed by several other experts in the field before the article is published in the journal in order to insure the article's quality. (The article is more likely to be scientifically valid, reach reasonable conclusions, etc.)

Non-refereed publications have not gone through through a formal peer review process. Refereed publications are typically reviewed by a number of other researchers who are knowledgeable in this domain and can judge the merit of the work (i.e., these are the author's "peers", which explains the name "peer review").