You can answer this question by using the UNT Library Catalog. Let's say you want to find this article at the UNT Libraries:
Russell, W., Gratz, S., Duncan, S., Holtrop, G., Ince, J., Scobbie, L., & ... Flint, H. (2011). High-protein, reduced-carbohydrate weight-loss diets promote metabolite profiles likely to be detrimental to colonic health. The American Journal Of Clinical Nutrition, 93(5), 1062-1072.
Go to the Libraries homepage
Type in the title of the journal and use the dropdown menu on the right to select Catalogued Books & More. Search

Look to see whether the journal is available online, in print, or both. Newer issues are usually in the online version and older issues in the print version.

For online, pick the FIND IT link that includes the year you need, in this case, 2011. The online journal will open, and you can browse to the individual article in that database.

For print, look at Library Has: for the year you need, and then select View All Copies to see where the volume is located and the Request Pickup button to request the volume needed.
