Use Google Scholar to search the scientific literature. A Scholar search will tell you if your subject is well represented in the scientific literature or if your subject is too narrow. If you only get 5-10 hits you'll need to broaden your topic. On the other hand, if you get 10,000 hits (not uncommon!) you'll know that you have to narrow your topic. (Discovery only searches materials in the DelVal collection; Google Scholar searches just about the whole world of current scientific literature.)
Also, try the following library databases individually--their holdings are included in Google Scholar but the individual databases include more precise search techniques and generally you will get better results.
If you have answered "yes" to these five questions you have probably located a scientific article.
Research articles are also often known as scientific or peer reviewed articles. If the article is NOT written by the person or group who did the research, it is NOT a peer-reviewed or scientific article. Research articles are important for knowing what new discoveries have been made. This is why it is important to use recent articles, since they will be the first things published on a new scientific development.
Here's a quick overview of how to identify these journal articles:
The reference section should include only published, significant, and relevant sources accessible through a library or an information system. These include journal articles, books, theses, dissertations, proceedings, bulletins, reports, and published abstracts of papers presented at meetings
Only initials of first names are listed. Order is last name, first initials for the first author. All other authors are listed by first initials and last name. Title of journal is abbreviated in most cases. Every line of each citation starts at the left margin--no hanging indents. See ASHA Style Manual for abbreviations
Last name, Initials. Year. Article title, sentence style capitalization. Abbreviated journal title Title volume(issue, if available): pages. URL.
Converse, R.H. 1960. Physiologic specialization of Fusicladium effusum and its evaluation in vitro. Phytopathology 56:527-531. https://www.cabdirect.org/cabdirect/abstract/19611100265.
Journal article with multiple authors
Last name, Initials., and Initials Last name. Year. Article title, sentence style capitalization. Abbreviated journal title volume(issue, if available):pages. URL.
Yates, I.E., D. Maxey, S. Lee, D. Sparks, and C.C. Reilly. 1996. Developing the pecan scab fungus on susceptible and resistant host and nonhost leaves. J. Amer. Soc. Hort. Sci. 121:350-357. https://journals.ashs.org/jashs/view/journals/jashs/121/3/article-p350.xml.
Last name, Initials. Year. Book title, sentence style capitalization. Edition (if available). Publisher (short form), location.
Hartmann, H.T., D.E. Kester, and F.T. Davies, Jr. 1990. Plant propagation principles and practices. 5th ed. Prentice Hall, Englewood Cliffs, N.J.
Last name, Initials. Year. Chapter title, sentence style capitalization, pages. In: Editors. Book title, sentence style capitalization. Edition (if available). Publisher (short form), location.
Brown, A.G. 1995. Apples, p. 3–37. In: J. Janick and J.N. Moore (eds.). Advances in fruit breeding. Purdue Univ. Press, West Lafayette, Ind.
Sponsoring society. Report title. Year. Conference number, City, Day Month (abbreviated) Year. (Proceedings, if known).
American Society for Horticultural Science. Tropical Region. 2000. Proc. XVIII Annu. Mtg., Miami, 25–30 Oct. 2000. (Proc. Trop. Reg. Amer. Soc. Hort. Sci. 14).
U.S. Department of Agriculture. 1997. Agricultural statistics for 1996. U.S. Dept. Agr., Washington, D.C.
Reeder, J.D. 2001. Nitrogen transformations in revegetated coal spoils. Colo. State Univ., Fort Collins, PhD Diss. Abstr. 81-26447.