Journals:
American Mathematical Monthly: online via JSTOR (1894-2019)
College Mathematics Journal: online via JSTOR (1984-2019)
Fibonacci Quarterly: This is a link to the Index page (you may want to start with the Subject Index, read the information at the beginning of the .pdf to understand how to search and interpret which issue you'll need to find). Back issues are free on the website (1963-2016). Full access to the current volume and the previous five volumes by subscription only. Tables of content and abstracts are open.
Comprehensive List of Math Journals via DePauw Libraries
REMINDER: You are highly encouraged to request an inter-library loan if an article you find is not available via the libraries full-text. See "Welcome!" tab on left-hand side for more info.
Searching Strategies:
For American Mathematical Monthly & College Mathematics Journal, you can follow the links to the title within JSTOR and run a keyword search on a topic of interest. You can also browse the online tables of contents for articles. For Fibonacci Quarterly, you can browse the Subject Index, and also browse back issues tables of contents.
You can also search for the three journals by Publication Name and Topic or Keyword within each of these databases; after you identify an article, click on the Find It button to link to the full text (if available).