Primary Research articles are nearly always presented in academic journals. They report on the process and results of primary research. They contain sections on: literature review, methods and materials, results and conclusions. Sometimes the sections have slightly different names. Primary articles tend to be more complex than other types of literature, but the abstract can help give you a general understanding of what will follow in the article.
Below is an example of a journal article. (click on image for full article)
You can tell it is a journal article because you can see the title of the journal, the volume, the pages and the date. This information is in the top left hand corner in the above example, but it can be on the opposite side, or at the bottom depending on the journal.
If you were going to cite the above journal in your bibliography, it would be cited as:
Shulman JM. 2015. Drosophila and experimental neurology in the post-genomic era. Experimental Neurology. 274: 4-13.
To cite the article within the text of your paper, write:
Here is another example from an online journal
The citations would look like this:
Gibert JM, Peronnet F, Schlötterer C. 2007. Phenotypic plasticity in Drosophila pigmentation caused by temperature sensitivity of a chromatin regulator network. PLOS Genetics. 3(2): e30.
When cited in your paper, it would look like this:
(Gibert et al. 2007)
Review articles are another type of article appearing in a scientific journal. Rather than reporting on original research, like a primary research article, a review article reports on the current state of knowledge about a topic, by presenting recent research about the topic.
An example of a review article is: Recent progress in understanding the role of ecdysteroids in adult insects: Germline development and circadian clock in the fruit fly Drosophila melanogaster.
You would cite this item:
Uryu O, Ameku T, Niwa R. 2015. Recent progress in understanding the role of ecdysteroids in adult insects: germline development and circadian clock in the fruit fly Drosophila melanogaster. Zoological Letters. 1(1): 1-12.
To cite this within your article you would write:
(Uryu et al. 2015)