Context: There are now 43 questions tagged reference-request.
The current tag wiki guidance is
For questions asking for references from the literature or textbooks on specific topics. If possible, references should be accompanied by a hyperlink to the article for accessibility.
Related OR Meta discussions like Avoid usage of non-permanent URLs to reference papers are very limited in scope.
Our own Help Center even states to
avoid asking subjective questions where every answer is equally valid.
Also from OR Meta,
Stack Exchange was not intended to be a list of links or a search engine telling users where to find their answers elsewhere. — Robert Cartaino ♦ (source)
Physics seems to have address this this topic by creating the specific-reference tag which has usage guidance that separates these "What is the canonical source for X?" or "What is the first paper on Y?" from general topical questions to use the resource-recommendation tag. The two tags are considered mutually exclusive. These topical resource recommendation tags must comply with the usage policy.
Resource recommendations must ask for descriptive answers. It's not enough to ask for a list of books that cover topic X — a simple Amazon search can provide that.
Instead, you should ask for recommendations, which specify:
- What the book covers
- How it covers it — is it rigorous? Intuitive? How is the writer's style?
- What are the prerequisites?
and similar questions. (Source: Physics.SE FAQ)
I expect these kinds of questions will likely continue on the site and we should note these questions can be highly useful.
Here are some examples of reference requests in reverse chronological order:
- Books in applied Online Optimization
- Categorization of optimization models
- Reference request for Evacuation Planning 
- Good textbook for queueing theory and performance modeling 
- Bridge the gap between theory and practice in Integer Programming
- PhD-level textbooks on linear programming
- Looking for books in the same style as Hans Kellerer 2004, Knapsack Problems
- references on the empirical study on the practice of OR
- References for "metric" network flow problems
- Good sources on developing mathematical models (closed)
- Classics in Operations Research from around WW II? 
- Recommended books/materials for practical applications of Operations Research in industry
- Single reference for Mixed Integer Programming formulations to linearize, handle logical constraints and disjunctive constraints, do Big M, etc? , also a fav of mine
Some questions are of dubious quality but without the tag:
The lack of guidance on reference-request questions currently leaves the site open to low quality generic questions that may have limited value for future visitors (similar to the gimme the codez questions on StackOverflow). While some users already attempt to improve these questions before answering, many (including myself) have rushed in to provide answers (see ). Perhaps the community should consider how these questions should be asked and how we should curate them on the site.
A few questions for discussion:
- What research is expected of someone asking a reference-request question?
- What should be included in the question?
- How should the community moderate these questions? (and if needed, improve their quality to help askers)
 Examples only include literature-specific requests (books, papers, references) and do not include benchmark problems, courses, etc.
 Disclosure for questions that I have also answered.